[1] Univ Stellenbosch, Mediclin Panorama, ZA-7500 Cape Town, Parow, South Africa
[2] Univ Stellenbosch, Dept Gynecol, ZA-7500 Cape Town, Parow, South Africa
[3] NIH, Natl Inst Environm Hlth Sci, Res Triangle Pk, NC USA
[4] Univ Virginia Hlth Syst, Dept Obstet & Gynecol, Charlottesville, VA USA
[5] Hosp Cima, Dept Endocrinol, San Jose, Costa Rica
[6] Univ Oxford, Oxford OX1 2JD, England
[7] Mt Alvernia Hosp, Singapore, Singapore
[8] Univ Geneva, CH-1211 Geneva 4, Switzerland