Professor Klapan graduated from Zagreb University School of Medicine. He has completed two postdoctoral studies from the same University (Clinical Immunology&Allergology, Otorhinolaryngology-Head&Neck Surgery) and his PHD (Eye&Ear Institute, Pittsburgh University, PA, USA and Zagreb University) at the age of 30 years. He is the founder/director of Klapan Medical Group University Polyclinic. He has published more than 110 papers in reputed journals; citations/>700; h-index: >25; 14 medical books (7/Croatian and 7/English language; editor, author and co-autor); chaired and headed a number of international surgical courses and symposia (>500 lectures; invited lecturer/moderator/president/ USA/EU/Asia/Australia;