Key points are not available for this paper at this time.
Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York, USA Reprint requests and correspondence: Dr. Lawrence J. Brandt, Montefiore Medical Center, 111 East 210 Street, Bronx, NY 10467. Received 20 October 2000; accepted 31 October 2000 J. Edward Berk, ACG Distinguished Lecture.
Lawrence J. Brandt (2001) studied this question.