Branko Bogdanic1,2,3. 1. Department of Surgery, University Hospital Centre Zagreb, Kispaticeva 12, 10000, Zagreb, Croatia. dr.bogdanic@gmail.com. 2. School of Medicine, University of Zagreb, 10000, Zagreb, Croatia. dr.bogdanic@gmail.com. 3. St. Catherine Specialty Hospital, 10000, Zagreb, Croatia. dr.bogdanic@gmail.com.