1. Division of Reproductive Medicine, Department of Obstetrics and Gynaecology (I.J.G.K., T.J.M.K., P.G.A.H., R.H., C.B.L.), de Boelelaan, 1117 Amsterdam, The Netherlands
2. Department of Internal Medicine (C.D.A.S.), Academic Hospital Maastricht, P. Debyelaan 25, 6202 AZ Maastricht, The Netherlands
3. Department of Internal Medicine (E.H.S., Y.M.S., R.T.d.J.), de Boelelaan, 1117 Amsterdam, The Netherlands