1. University Hospitals and Boston University Medical Center, Boston City Hospital, and Boston Lying-in Hospital, Boston, Mass.
2. Boston University Medical Center, Boston, Mass.; Present address: Chief of Hematology, Orange County General Hospital, Orange, Calif.
3. Department of Obstetrics and Gynecology, Boston. City Hospital, Boston, Mass.
4. Department of Obstetrics and Gynecology, Boston City Hospital, and Assistant Professor, Harvard Medical School, Boston, Mass.
5. Boston Lying-ill Hospital, Boston, Mass.