1. Neonatology, Universitaire Ziekenhuizen Leuven, Leuven, Belgium;
2. Obstetrics and Gynaecology, Universitaire Ziekenhuizen Leuven, Leuven, Belgium;
3. Laboratory of Comparative Endocrinology, KU Leuven, Leuven, Belgium;
4. Department of Neonatology, University Hospitals Leuven, Leuven, Belgium;
5. Laboratory of Intensive Care Medicine, KU Leuven, Leuven, Belgium;
6. Laboratory of Intensive Care Medicine, Catholic University Leuven, Leuven, Belgium;
7. Department of Neonatology, University Hospitals Leuven, Leuven, Belgium