1. Paediatric Endocrinology , Department of Paediatrics and Adolescent Medicine , University Hospital of Erlangen , Erlangen , Germany
2. Paediatric Urology , Department of Urology , University Hospital of Erlangen , Erlangen , Germany
3. Division of Paediatric Endocrinology , Department of Paediatrics , University Hospital, Friedrich Alexander-Universität Erlangen-Nürnberg , Loschgestr. 15 , 91054 Erlangen , Germany