1 University of Belgrade, Faculty of Medicine, Belgrade; Department for Gastroenterology and Hepatology, Clinic for Internal Medicine, Dr Dragisa Misovic- Dedinje University Clinical Hospital Center, Belgrade, Serbia. dr.dusan.popovic@gmail.com.
2 University of Belgrade, Faculty of Medicine, Belgrade; Richard Burian Institute of Medical Physiology, Belgrade, Serbia. mrj.stojanovic@gmail.com.
3 Euromedik General Hospital, Belgrade, Serbia. tommilos@hotmail.com.
4 University of Belgrade, Faculty of Medicine, Belgrade; Clinic for Gastroenterohepatology, University Clinical center of Serbia, Belgrade, Serbia. drmilicastojkovic@gmail.com.
5 University of Belgrade, Faculty of Medicine, Belgrade; Clinic for Surgery, Dr Dragisa Misovic-Dedinje University Clinical Hospital Center Belgrade, Serbia. tijana.glisic78@gmail.com.
6 University of Belgrade, Faculty of Medicine, Belgrade, Serbia; Clinic for Surgery, University Clinical Hospital Center "Dr Dragisa Misovic-Dedinje" Belgrade, Serbia. psavic-md@hotmail.com.
7 University of Belgrade, Faculty of Medicine, Belgrade; Department for Gastroenterology and Hepatology, Clinic for Internal Medicine, Dr Dragisa Misovic- Dedinje University Clinical Hospital Center, Belgrade, Serbia. branka.filipovic3@gmail.com.