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Datla G Varma, M.D.

Present Title & Affiliation

Primary Appointment

Professor, Department of Diagnostic Radiology, Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, Houston, TX

Office Address

The University of Texas MD Anderson Cancer Center
1400 Pressler Street
Unit Number: 1473
Houston, TX 77030
Room Number: FCT15.5036
Phone: (713) 792-2720
Email: dvarma@mdanderson.org

Education & Training

Degree-Granting Education

1974 Andhra Medical College, Vizag, India, MBBS, Medicine

Postgraduate Training

1980-1983 Clinical Residency, Diagnostic Radiology, University Hospital, Cincinnati, OH
1978-1980 Clinical Fellowship, Nuclear Medicine, University Hospital, Cincinnati, OH
1977-1978 Clinical Residency, Anatomic Pathology, Good Samaritan Hospital, Cincinnati, OH
1974-1975 Rotating Internship, Radiology, King George Hospital, Vizag, India

Board Certifications

1983 American Board of Radiology
1980 American Board of Nuclear Medicine

Honors and Awards

2010-present Marquis Who's Who in the World
2009-present Marquis Who's Who In Medicine and Healthcare
2007-present Marquis Who's Who in America
2007-2008 Guide to America's Top Physicians, Consumers Research Council of America
1997 Certificate of Merit, American Roentgen Ray Society
1992 Certificate of Merit, Radiological Society of North America
1992 Magna Cum Laude, Radiological Society of North America
1991 Summa Cum Laude Award, Radiological Society of North America
1989 Certificate of Merit, American Roentgen Ray Society
1988 Cum Laude Award, Radiological Society of North America
1969 1st Class in II M.B.B.S. - Anatomy, Physiology, Pathology, Forensic Medicine, Andhra University
1968 Ranked 1st - Physics, Biology, Chemistry Group, Andhra University

Professional Memberships

American College of Radiology
Member, 1989-present
American Medical Association
Member, 1989-present
American Roentgen Ray Society
Member, 1989-present
Harris County Medical Society
Member, 1989-present
International Society for Magnetic Resonance in Medicine
Member, 1989-present
Radiological Society of North America
Member, 1989-present
Society of Nuclear Medicine
Member, 1989-present
Texas Radiological Society
Member, 1989-present

Selected Publications

Peer-Reviewed Original Research Articles

1. Francis IR, Cohan RH, Varma DG, Sondak VK. Retroperitoneal sarcomas. Cancer Imaging 5(1):89-94, 2005. PMCID: PMC1665230.
2. Iwasko N, Steinbach LS, Disler D, Pathria M, Hottya GA, Kattapuram S, Varma DG, Kumar R. Imaging findings in Mazabraud's syndrome: seven new cases. Skeletal Radiol 31(2):81-7, 2002. e-Pub 1/2002. PMID: 11828328.
3. Meric F, Hess KR, Varma DG, Hunt KK, Pisters PW, Milas KM, Patel SR, Benjamin RS, Plager C, Papadopoulos NE, Burgess MA, Pollock RE, Feig BW. Radiographic response to neoadjuvant chemotherapy is a predictor of local control and survival in soft tissue sarcomas. Cancer 95(5):1120-6, 2002. PMID: 12209699.
4. Fleming JB, Cantor SB, Varma DG, Holst D, Feig BW, Hunt KK, Patel SR, Benjamin RS, Pollock RE, Pisters PW. Utility of chest computed tomography for staging in patients with T1 extremity soft tissue sarcomas. Cancer 92(4):863-8, 8/2001. PMID: 11550159.
5. Varma DG. Imaging of soft-tissue sarcomas. Curr Oncol Rep 2(6):487-90, 2000. PMID: 11122882.
6. Barnett CC, Varma DG, El-Naggar AK, Dackiw AP, Porter GA, Pearson AS, Kudelka AP, Gagel RF, Evans DB, Lee JE. Limitations of size as a criterion in the evaluation of adrenal tumors. Surgery 128(6):973-82; discussion 982-3, 2000. PMID: 11114632.
7. Corral DA, Varma DG, Jackson EF, Amato RJ, Donat SM, Pisters LL. Magnetic resonance imaging and magnetic resonance angiography before postchemotherapy retroperitoneal lymph node dissection. Urology 55(2):262-6, 2000. PMID: 10688091.
8. Varma DG. Optimal radiologic imaging of soft tissue sarcomas. Semin Surg Oncol 17(1):2-10, Jul-Aug, 1999. PMID: 10402633.
9. Kudelka AP, Hasenburg A, Verschraegen CF, Edwards CL, Meyers CA, Varma DG, Friedman RS, Forman A, Conrad CA, Grove W, Grothy A, Kavanagh JJ. Phase II study of I.V. C1-980 in patients with advanced platinum refractory epithelial ovarian carcinoma 9(5):405-409, 1998.
10. Yu GH, Staerkel GA, Kershisnik MM, Varma DG. Fine-needle aspiration of pigmented villonodular synovitis of the temporomandibular joint masquerading as a primary parotid gland lesion. Diagn Cytopathol 16(1):47-50, 1997. PMID: 9034737.
11. Resnick JM, Fanning CV, Caraway NP, Varma DG, Johnson M. Percutaneous needle biopsy diagnosis of benign neurogenic neoplasms. Diagn Cytopathol 16(1):17-25, 1997. PMID: 9034731.
12. Pisters PW, Patel SR, Varma DG, Chen SC, Chen NP, nguyen HT, Geig BW, Pollack A, Pollock RE, Benjamin RS. Preoperative chemotherapy for stage IIIB extremity soft tissue sarcoma: long-term results from a single institution. J Clin Oncol 15(12):3481-3487, 1997.
13. Nazeer T, Ro JY, Varma DGK, de la Hermosa JR, Ayala AG. Chondromyxoid fibroma of paranasal sinuses: report of two cases presenting with nasal obstruction. Skeletal Radiol 25(8):779-782, 1996. PMID: 8958628.
14. Freundlich IM, Chasen MH, Varma DG. Magnetic resonance imaging of pulmonary apical tumors. J Thorac Imaging 11(3):210-222, 1996. PMID: 8784734.
15. Wright-Browne V, Kudelka AP, Malpica A, Edwards CL, Varma DG, Kavanagh JJ. Persistent partial molar pregnancy. A report of uterus-preserving treatment and follow-up with magnetic resonance imaging. Am J Clin Oncol 19(5):534-539, 1996. PMID: 8823486.
16. Calava JM, Patt RB, Reddy S, Varma DG, Chiang J. Psoas sheath chemical neurolysis for management of intractable leg pain from metastatic liposarcoma. Clin J Pain 12(1):69-75, 1996. PMID: 8722739.
17. Kudelka AP, Termrungruanglert W, Vadhan-Raj S, Edwards CL, Varma DG, Tornos C, Verschraegen CF, Kavanagh JJ. Remission of advanced uterine leiomyosarcoma with pulmonary metastases with carboplatin and paclitaxel. Anticancer Drugs 7(8):885-889, 1996. PMID: 8991194.
18. Kavanagh JJ, Kudelka AP, De Leon CG, Tresukosol D, Hord M, Finnegan MB, Kim EE, Varma D, Forman A, Cohen P, Edwards CL, Freedman RS, Verschraegen CF. Research phase II study of docetaxel in patients with epithelial ovarian carcinoma refractory to platinum. Clin Cancer Res 2(5):837-842, 1996.
19. Varma DG, Yoshimitsu K, Manning JT. Retroperitoneal granular cell tumor. Computed tomography findings with 5-year follow-up. Clin Imaging 20(4):279-281, 1996. PMID: 8959369.
20. Varma DG, Jackson EF, Pollock RE, Benjamin RS. Soft-tissue sarcoma of the extremities. MR appearance of post-treatment changes and local recurrences. Magn Reson Imaging Clin N Am 3(4):695-712, 11/1995. PMID: 8564690.
21. Tresukosol D, Kudelka AP, Malpica A, Varma DG, Edwards CL, Kavanagh JJ. Leuprolide acetate and intravascular leiomyomatosis. Obstet Gynecol 86(4 Pt 2):688-92, 1995. PMID: 7675416.
22. Lopez AG III, Tornos C, Kudelka AP, Varma DG, Kavanagh JJ. Multiple nodules of intermediate trophoblast with vaginal metastasis. Cancer Bull 47(3):264-267, 1995.
23. Yoshimitsu K, Varma DG, Jackson EF. Unsuppressed fat in the right anterior diaphragmatic region on fat-suppressed T2-weighted fast spin-echo MR images. J Magn Reson Imaging 5(2):145-9, Mar-Apr, 1995. PMID: 7766975.
24. Varma DG, Grossman J, Draper EJ, Durke VW. Computerized scientific exhibit in radiology: a valuable format for delivering scientific information. Radiographics 14(5):1127-38, 1994. PMID: 7991819.
25. Caraway NP, Staerkel GA, Fanning CV, Varma DG, Pollock RE. Diagnosing intramuscular myxoma by fine-needle aspiration: a multidisciplinary approach. Diagn Cytopathol 11(3):255-61, 1994. PMID: 7867468.
26. Varma DG, Ro JY, Guo SQ, Moulopoulos LA. Magnetic resonance imaging appearance of foreign body granulomas of the upper arms. Clin Imaging 18(1):39-42, Jan-Mar, 1994. PMID: 8180859.
27. Kumar R, Arya S, Varma DG, Moser R Jr, Madewell J, Swischuk L. Scapula: normal and abnormal. Postgrad Radiol 14:113-130, 1994.
28. Charnsangavej C, Kirk IR, Dubrow RA, Chuang VP, Curley SA, Roh MS, Varma DG, Patt YZ. Arterial complications from long-term hepatic artery chemoinfusion catheters: evaluation with CT. AJR Am J Roentgenol 160(4):859-64, 1993. PMID: 8456682.
29. Varma DG, Parihar A, Richli WR. CT appearance of the distended trochanteric bursa. J Comput Assist Tomogr 17(1):141-3, Jan-Feb, 1993. PMID: 8419424.
30. Charnsangavej C, DuBrow RA, Varma DG, Herron DH, Robinson TJ, Whitley NO. CT of the mesocolon. Part 1. Anatomic considerations. Radiographics 13(5):1035-45, 1993. PMID: 8210588.
31. Charnsangavej C, Dubrow RA, Varma DG, Herron DH, Robinson TJ, Whitley NO. CT of the mesocolon. Part 2. Pathologic considerations. Radiographics 13(6):1309-22, 1993. PMID: 8290726.
32. Iyer R, Eftekhari F, Varma DG, Jaffe N. Cystic retroperitoneal lymphangioma: CT, ultrasound and MRI findings. Pediatr Radiol 23(4):305-306, 1993.
33. Moulopoulos LA, Varma DG, Charnsangavej C, Wallace S. Magnetic resonance imaging and computed tomography appearance of asymptomatic paravaginal cysts. Clin Imaging 17(2):126-32, Apr-Jun, 1993. PMID: 8348402.
34. Varma DG, Ayala AG, Guo SQ, Moulopoulos LA, Kim EE, Charnsangavej C. MRI of extraskeletal osteosarcoma. J Comput Assist Tomogr 17(3):414-7, May-Jun, 1993. PMID: 8491903.
35. McDaniel KP, Charnsangavej C, DuBrow RA, Varma DG, Granfield CA, Curley SA. Pathways of nodal metastasis in carcinomas of the cecum, ascending colon, and transverse colon: CT demonstration. AJR Am J Roentgenol 161(1):61-4, 1993. PMID: 8517322.
36. Moulopoulos LA, Dimopoulos MA, Varma DG, Manning JT, Johnston DA, Leeds NE, Libshitz HI. Waldenstr÷m macroglobulinemia: MR imaging of the spine and CT of the abdomen and pelvis. Radiology 188(3):669-73, 1993. PMID: 8351330.
37. Varma DG, Ayala AG, Carrasco CH, Guo SQ, Kumar R, Edeiken J. Chondrosarcoma: MR imaging with pathologic correlation. Radiographics 12(4):687-704, 1992. PMID: 1636034.
38. Varma DG, Moulopoulos A, Sara AS, Leeds N, Kumar R, Kim EE, Wallace S. MR imaging of extracranial nerve sheath tumors. J Comput Assist Tomogr 16(3):448-53, May-Jun, 1992. PMID: 1317391.
39. Moulopoulos LA, Varma DG, Dimopoulos MA, Leeds NE, Kim EE, Johnston DA, Alexanian R, Libshitz HI. Multiple myeloma: spinal MR imaging in patients with untreated newly diagnosed disease. Radiology 185(3):833-40, 1992. PMID: 1438772.
40. Varma DG, McDaniel K, Ordˇ˝ez NG, Granfield CA, Charnsangavej C, Wallace S. Primary malignant small round cell tumor of the abdomen: CT findings in five cases. AJR Am J Roentgenol 158(5):1031-4, 1992. PMID: 1566662.
41. Granfield CA, Charnsangavej C, Dubrow RA, Varma DG, Curley SA, Whitley NO, Wallace S. Regional lymph node metastases in carcinoma of the left side of the colon and rectum: CT demonstration. AJR Am J Roentgenol 159(4):757-61, 1992. PMID: 1529837.
42. Moon TD, Fox LS, Varma DG. Testicular teratocarcinoma with intracaval metastases to the heart. Urology 40(4):368-70, 1992. PMID: 1413360.
43. Varma DG, Moulopoulos A, Sara AS, Kim EE, Wallace S. Case report 682. Neuroepithelioma of soft tissues of the knee. Skeletal Radiol 20(5):391-3, 1991. PMID: 1896883.
44. Varma DG, Richli WR, Charnsangavej C, Samuels BI, Kim EE, Wallace S. MR appearance of the distended iliopsoas bursa. AJR Am J Roentgenol 156(5):1025-8, 1991. PMID: 2017926.
45. Varma DG, Kumar R, Carrasco CH, Guo SQ, Richli WR. MR imaging of periosteal chondroma. J Comput Assist Tomogr 15(6):1008-10, Nov-Dec, 1991. PMID: 1939750.
46. Choi H, Varma DG, Fornage BD, Kim EE, Johnston DA. Soft-tissue sarcoma: MR imaging vs sonography for detection of local recurrence after surgery. AJR Am J Roentgenol 157(2):353-358, 1991. PMID: 1853821.
47. Varma DG, Thorneycroft IH, Degefu S, Eberly SM, Smith LG. Magnetic resonance imaging of adult ovarian granulosa cell tumor. Case report. Clin Imaging 14(1):55-8, 1990. PMID: 2322884.
48. Cho JS, Kim EE, Varma DG, Wallace S. MR imaging of hepatosplenic candidiasis superimposed on hemochromatosis. J Comput Assist Tomogr 14(5):774-6, Sep-Oct, 1990. PMID: 2398158.
49. Varma DG, Holmes JW. Ga-67 scintigraphy of ischiorectal fossa horseshoe abscess. Clin Nucl Med 14(7):538-9, 1989. PMID: 2766636.
50. Varma DG, Schoenberger SG, Kumra A, Agrawal N, Robinson AE. Osler-Weber-Rendu disease: MR findings in the liver. J Comput Assist Tomogr 13(1):134-5, Jan-Feb, 1989. PMID: 2910932.
51. Varma DG, Murayama S, Etheredge E, Robinson AE. Computed tomography demonstration of unusual diffuse metastatic calcification secondary to renal failure. J Comput Tomogr 12(4):282-6, 1988. PMID: 3197429.
52. Varma DG, Faust JM. Computed tomography of gangrenous acute postoperative acalculous cholecystitis. J Comput Tomogr 12(1):29-31, 1988. PMID: 3258224.
53. Campeau RJ, Varma DG, Hirano T, McArthur DA. Diffuse bone marrow metastases observed incidental to liver-spleen imaging. Clin Nucl Med 13(12):919, 1988. PMID: 2854507.
54. Godiwala T, Andry M, Varma DG. Unusual cause of gastric outlet obstruction: CT findings in Bouveret's syndrome. South Med J 81(7):919-21, 1988. PMID: 3393953.
55. Varma DG, Muchmore JH, Mizushima A. Computed tomography of infiltrating benign lipoma. J Comput Tomogr 11(1):45-9, 1/1987. PMID: 3802879.
56. Varma DG, Nice CM, Numaguchi Y, Campeau RJ. Computed tomography of the intravertebral vacuum cleft. Rev Interam Radiol, 1987.
57. Nice CM, Smith A, Varma DG, Rojo J. Drowned lung. Rev Interam Radiol 12:231-234, 1987.
58. Nice CM, Smith A, Varma DG. Hypertranslucency in bronchial obstruction. Rev Interam Radiol 12:225-229, 1987.
59. Campeau RJ, Bellah RD, Varma DG. Pathologic fractures in a patient with renal osteodystrophy. Failure of early detection on bone scans. Clin Nucl Med 12(7):510-3, 1987. PMID: 3608330.
60. Varma DG, Godiwala T. Unusual metastases from esophageal carcinoma: computed tomography demonstration. J Comput Tomogr 11(2):205-7, 1987. PMID: 3581860.
61. Heriard JB, Varma DG. A lung opacity caused by grid artifact. Radiol Technol 58(2):147-8, Nov-Dec, 1986. PMID: 3786696.
62. Nelson AW, Reed HT, Haney PJ, Varma DG, Adams K, Beckett W, Whitley JE. Gray-scale (B-mode) sonography of the maxillary sinus. J Ultrasound Med 5(9):477-81, 1986. PMID: 3531539.
63. Hovda E, Wall M, Numaguchi Y, Varma DG. Neurosarcoidosis involving optic nerves and leptomeninges: computed tomography findings. J Comput Tomogr 10(2):129-33, 1986. PMID: 3698629.
64. Campeau RJ, Ey EH, Varma DG. Thallium-201 uptake in a benign thymoma. Clin Nucl Med 11(7):524, 1986. PMID: 3731658.
65. Varma DG, Numaguchi Y, Nadell JM, Fleming MS. Multiple cerebral aneurysms associated with left-sided inferior vena cava and hemiazygos continuation: a case report. J Comput Tomogr 9(2):101-5, 1985. PMID: 3987328.
66. Varma DG, Nelson A, Mizushima A, Moulder P. Subpleural pulmonary hamartoma: demonstration by computed tomography. J Comput Tomogr 8(3):215-8, 1984. PMID: 6744923.

Abstracts

1. Meric F, Hess KR, Varma DGK, Hunt KK, Pisters PWT, Milas M, Patel SR, Benjamin RS, Plager C, Papadopolous NEJ, Burgess MA, Pollock RE, Feig BW. Impact of neoadjuvant therapy on local control of soft tissue sarcomas. Annual Meeting of the American Society of Clinical Oncology, 2000.
2. Varma DGK, Jackson EF, Corral DA, Pisters LL. MR imaging and MR angiography prior to post-chemotherapy retroperitoneal lymphadenectomy for non-seminomatour germ cell testicular cancer. Proceedings of the 6th Annual Meeting of the International Society for Magnetic Resonance in Medicine 1:224, 1998.
3. Steinbach LS, Disler D, Pathria M, Hottya G, Helms C, Kattapuram S, Varma DGK, Kumar R. Update on imaging findings in Mazabraud's syndrome: seven new cases. Supplement to AJR Am J Roentgen 170(4):p. 94, 1998.
4. Freundlich IM, ChasenM, Powell F, Raval A, Varma DGK. Outcomes analysis of pulmonary apical carcinomas and the predictability of MR imaging for resectability. Supplement to AJR Am J Roentgen 168:111, 1997.
5. Ibukuro K, Charnsangavej C, Cinqualbre A, DuBrow RA, Varma DGK, Wallace S. Helical CT and multiplanar reformation of the pancreas and peripancreatic vessels. Radiological Society of North America Supplement to Radiology 185 (P):257, 1993.
6. Moulopoulos LA, Varma DGK, Charnsangavej C. MR and CT imaging appearance of asymptomatic paravaginal cysts. J Magn Reson Imaging 2(P):p. 134, 1992.
7. Moulopoulos LA, Varma DGK, Dimopoulos MA. Waldenstrom Macroglobulemia: CT and MR imaging in 21 patients. Radiological Society of North America Supplement to Radiology 185(P):p. 194, 1992.
8. Varma DGK, Ayala AG, Carrasco CH, Guo SO, Kumar R, Edeiken J. Chondrosarcoma: MR imaging 21 cases with pathological correlation. The Radiological Society of North America Supplement to Radiology 181(P):342, 1991.
9. Kim EE, Choi H, Cho BJ, Varma DGK, Fornage BD, Chasen MH. Complimentary roles of MR imaging and US in the differentiation of recurrent malignant softtissue tumors from post treatment change. J Magn Reson Imaging 1(2):246, 1991.
10. Misra LK, Varma DGK, Hazle JD, Kim I, Hargis BM. MR imaging in the evaluation of virus induced immunosuppression. J Magn Reson Imaging 1(2):246, 1991.
11. Choi H, Varma DGK, Fornage BD, Kim EE. Comparison of MRI and ultrasound in the differentiation of recurrent malignant soft tissue neoplasms from post-operative changes. 9th Annual Meeting of the Society for Magnetic Resonance Imaging in Medicine 9th Annual Meeting 1:196, 1990.
12. Varma DGK, Misra LK, Richli WR, Charnsangavej C. MR imaging of the distended iliopsoas bursa. 9th Annual Meeting of the Society for Magnetic Resonance Imaging in Medicine 2:776, 1990.
13. Misra LK, Varma DGK, Kim EE, Todd LE, Elizonda Rojas E. MRI of sciatic nerve in diabetics with peripheral neuropathy. Magn Reson Imaging 8 (suppl):123, 1990.
14. Chung SK, Kim EE, Varma DGK, Podoloff DA. Paraskeletal Ewing's sarcoma evaluated by MRI, CT and bone scan. 9th Annual Meeting of the Society for Magnetic Resonance Imaging in Medicine 1:771, 1990.
15. Kim EE, Chung SK, Cho JS, Varma DGK, Podoloff DA. Skeletal lymphoma evaluated by MRI, bone scan, radiograph and CT. 9th Annual Meeting of the Society for Magnetic Resonance Imaging in Medicine 1:195, 1990.
16. Kim EE, Chung SL, Cho JS, Varma DGK, Podoloff DA. Skeletal lymphoma evaluated by MRI, bone scan, radiograph and CT. Book of Abstract -9th Annual meeting of Society for the Magnetic Rasonance Imaging in Medicine 1:195, 1990.
17. Robinson AE, Eberly SE, Palmon L, Varma DGK, Mulvihill DM. Developmental defects of the diaphragm. Radiological Society of North America (RSNA Supplemental) 173(P), 1988.
18. Gerson MC, Varma DG, Nishiyama H, Gelfand MJ. Evidence of left ventricular aneurysm by thallium-201 myocardial scintigraphy. Radiology 149:908, 1983. PMID: 6851358.

Book Chapters

1. Francis IR, Cohan RH, Varma DGK, Sondak VK. Primary retroperitoneal tumors. In: Imaging in Oncology. Vol 1, 2nd ed. Ed(s) JA Husband, RH Reznek. Taylor and Francis: London, 497-513, 2004.
2. Varma DGK, Eberly, SM. Radiology of mediastinal injuries. In: Thoracic Surgery: Surgical Management of Chest Injuries (International Trends in General Thoracic Surgery). Vol 7. Ed(s) WR Webb, A Besson. Mosby Yearbook: St. Louis, 353-362, 1991.
3. Weinberg S, Varma DGK. The relationship of plain film radiology to the scintigraphic evaluation of bone disease. In: Bone Scintigraphy. Ed(s) EB Silberstein. Futura: Mount Kisco, 1-12, 1984.
4. Maxon HR III, Varma DGK. Thyroid. In: Differential Diagnosis in Nuclear Medicine. Ed(s) EB Silberstein, JG McAfee. McGraw Hill: New York, 92-110, 1984.

Letters to the Editor

1. Varma DG, Campeau RJ, Kartchner ZA, Karnik S. Scintigraphic detection of splenosis causing ureteral compression and hydronephrosis. AJR Am J Roentgenol 156(2)(2):406, 1991. PMID: 1898829.

Manuals, Teaching Aids, Other Teaching Publications

1. Varma DGK, Grossman J, Draper E, Durke III V. Soft-tissue sarcoma of the extremities and its mimics: clinicopathologic and MR imaging features, http://www3.mdanderson.org/depts/rpi/mmlearn/sts/2003_titlepage.html, 1995.
2. Varma DGK, Grossman J, Draper E, Durke III V. Demo of MR imaging of extremity soft tissue sarcoma and mimics as WWW document on the internet, 1994.
3. Varma DGK, Grossman J, Draper EJ, Durke III V. Computerized module, 1993.
4. Varma DGK, Ayala A, Carrasco CH, Guo SQ, Kumar R, Edeiken J. Chrondrosarcoma: MR imaging in 21 cases with pathological correlation, 1992.

Last updated: 7/1/2013