Jan Lebl1, Andrea Luczay2, Feyza Darendeliler3, Rasa Verkauskienė4. 1. Department of Paediatrics, 2nd Faculty of Medicine, Charles University and University Hospital Motol, Prague, Czech Republic. 2. 1st Department of Paediatrics, Semmelweis University, Budapest, Hungary. 3. Department of Paediatrics, Istanbul University, Istanbul, Turkey. 4. Institute of Endocrinology, Kaunas, Lithuania.