1. From the Division of Human Nutrition and Epidemiology, Wageningen Agricultural University, Wageningen, Netherlands; the Departments of Obstetrics and Gynaecology and Epidemiology and the Laboratory of Endocrinology and Reproduction, University Hospital Nijmegen St Radboud, Nijmegen, Netherlands; and the Laboratory of Metabolic Diseases, Wilhelmina Children's Hospital, Utrecht, Netherlands.