1. St. Catherine Hospital, Zabok, Croatia
2. School of Medicine, University of Rijeka, Rijeka, Croatia
3. Clinical Hospital Dubrava, Zagreb, Croatia
4. Faculty of Medicine Osijek, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia
5. Clinical Hospital Center Osijek, Osijek, Croatia
6. Arithera Clinic, Zagreb, Croatia