1. Division of Reproductive Medicine, Department of Obstetrics, Gynaecology and Reproductive Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam MB, The Netherlands
2. Division of Endocrinology, Department of Internal Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam MB, The Netherlands
3. Department of Epidemiology and Biostatistics, Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam MB, The Netherlands
4. Division of Endocrinology, Department of Internal Medicine, Erasmus Medical Center, Rotterdam CA, The Netherlands