1. University Medical Centre Ljubljana, University Children’s Hospital, Clinical Institute for Special Laboratory Diagnostics , Vrazov trg 1 , Ljubljana , Slovenia
2. University Medical Centre Ljubljana, University Children’s Hospital, Department of Endocrinology, Diabetes and Metabolic Diseases , Bohoričeva 20 , Ljubljana , Slovenia
3. University of Ljubljana, Faculty of Medicine , Vrazov trg 2 , Ljubljana , Slovenia
4. University Medical Centre Ljubljana , Zaloška cesta 2 , Ljubljana , Slovenia