1. From the Section of Reproductive and Developmental Medicine, Brown University Program in Medicine, and the departments of Pediatrics and Medicine, Rhode Island Hospital and Roger Williams General Hospital, Providence, RI, the Department of Pediatrics, Harvard Medical School, and the Division of Infectious Diseases, Department of Medicine, Children's Hospital Medical Center, Boston, MA (address reprint requests to Dr. Peter at the Division of Infectious Diseases, Rhode Island Hospital, 593 Eddy St.,...