Reply.
Division of Gastroenterology, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, MI.
Robert J
RJ
Fontana
National Institute of Allergy and Infectious Diseases, Bethesda, MD.
Ronald E
RE
Engle
National Institute of Allergy and Infectious Diseases, Bethesda, MD.
Robert H
RH
Purcell
University of Texas Southwestern, Dallas, TX.
William M
WM
Lee