1. 1Unit of Paediatric Endocrinology and Diabetes, Hospital Dona Estefânia, Lisbon, Portugal
2. 2Comprehensive Health Research Centre, NOVA Medical School, Universidade NOVA de Lisboa, Lisbon, Portugal
3. 3Children’s Hospital AUF DER BULT, Hannover, Germany
4. 4Hannover Medical School, Hannover, Germany