1. Dortmund Nutritional and Anthropometric Longitudinally Designed Study Center, Institute of Nutrition and Food Science, Nutritional Epidemiology, University of Bonn, Dortmund, Germany
2. Steroid Research and Mass Spectrometry Unit, Center of Child and Adolescent Medicine, Justus-Liebig-University, Giessen, Germany
3. Children’s Hospital, University of Cologne, Cologne, Germany