1. Department of Epidemiology, Erasmus Medical Center Rotterdam, University Medical Center , P.O. Box 2040, 3000 CA Rotterdam , The Netherlands
2. Department of Public Health and Occupational Health, Amsterdam University Medical Center, Location AMC , P.O. Box 22660, 1100 DD Amsterdam , The Netherlands
3. Department of Public Health, Erasmus Medical Center Rotterdam, University Medical Center , P.O. Box 2040, Rotterdam, CA 3000 , The Netherlands
4. Department of Obstetrics and Gynaecology, Erasmus Medical Center Rotterdam, University Medical Center , PO Box 2040, 3000 CA Rotterdam , The Netherlands
5. Department of Internal Medicine, Erasmus Medical Center Rotterdam, Cardiovascular Institute Erasmus MC, University Medical Center , PO Box 2040, 3000 CA Rotterdam , The Netherlands