1. Department of Epidemiology, Erasmus MC University Medical Center Rotterdam Rotterdam the Netherlands
2. Department of Internal Medicine, Erasmus MC University Medical Center Rotterdam Rotterdam the Netherlands
3. Department of Clinical Chemistry, Erasmus MC University Medical Center Rotterdam Rotterdam the Netherlands
4. Division of Reproductive Endocrinology and Infertility, Department of Obstetrics and Gynecology, Erasmus MC University Medical Center Rotterdam Rotterdam the Netherlands