University of Western Australia, Faculty of Health and Medical Sciences, Perth, WA, Australia

Correspondence to Mohan Isaac, University of Western Australia, Faculty of Health and Medical Sciences, Perth, WA 6009, Australia. E-mail: [email protected]; Igor Filipčić, University Hospital “Sveti Ivan”, Zagreb, Croatia; School of Medicine, University of Zagreb, Zagreb, Croatia; Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, Osijek, Croatia. E-mail: [email protected]