Berkowitz R L, Lynch L, Chitkara U, Wilkins I A, Mehalek K E, Alvarez E
Department of Obstetrics, Gynecology, and Reproductive Science, Mount Sinai School of Medicine, New York, NY 10029.
N Engl J Med. 1988 Apr 21;318(16):1043-7. doi: 10.1056/NEJM198804213181607.