1. University Children's Hospital, Department of Neonatology, RWTH Aachen University, D-52074 Aachen, Germany
2. Division of Endocrinology and Diabetes, RWTH Aachen University, D-52074 Aachen, Germany
3. Prenatal Diagnosis and Obstetrics, Department of Gynaecology and Obstetrics, RWTH Aachen University, D-52074 Aachen, Germany