1 Department of Endocrinology, Diabetes and Metabolism, University Children's Hospital, University Medical Centre Ljubljana, Ljubljana, Slovenia, primoz.kotnik@mf.uni-lj.si.
2 Department of Pediatrics, Medical Faculty, University of Ljubljana, Ljubljana, Slovenia, primoz.kotnik@mf.uni-lj.si.
3 Developmental Endocrinology Research Group, Royal Hospital for Sick Children, University of Glasgow, Glasgow, United Kingdom.
4 Department of Endocrinology, Diabetes and Metabolism, University Children's Hospital, University Medical Centre Ljubljana, Petach Tikva, Israel.
5 Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel.