1. Maternal Health Research Centre (R.S., E.-C.C.), John Hunter Hospital, Newcastle, NSW 2310, Australia
2. Reproductive Endocrinology Center (S.M., R.B.J.), Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, San Francisco, California 94143
3. Department of Endocrinology (S.B.), Prince of Wales Hospital, High Street, Randwick, NSW 2031, Australia