1. Department of Public and Occupational Health (M.N.M.v.P., N.O., W.v.M.), EMGO+ Institute for Health and Care Research, Amsterdam 1081 BT, The Netherlands;
2. Department of Endocrinology (M.E.W.E.), Amsterdam 1081 BT, The Netherlands;
3. Department of Obstetrics and Gynecology (M.G.A.J.W.), VU University Medical Centre, Amsterdam 1081 BT, The Netherlands;
4. Department of Obstetrics and Gynecology (P.M.C.), Case Western Reserve University, MetroHealth, Cleveland, Ohio 44106