The column in this issue is supplied by Herbert L. Fred, M.D., M.A.C.P., and Hendrik A. van Dijk, both from McGovern Medical School-UT Health, Houston, Texas. Dr. Fred is emeritus professor of medicine and a well-known medical educator and diagnostician. A graduate of Johns Hopkins University School of Medicine, he has authored just under 500 publications including six books. Mr. van Dijk, former director of the University of Texas Health Science Center Medical School's Graphic Communications Group, has devoted 50 years to biomedical communications and is a national expert in that field.
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