1. Department of Family Medicine and Public Health, College of Medicine and Health Sciences, Sultan Qaboos University, Muscat, Oman
2. Faculty of Medicine and Health, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
3. Department of Finance and Economics, College of Business and Economics, Qatar University, Doha, Qatar
4. Director General, Sultan Qaboos University Hospital, Sultan Qaboos University, Muscat, Oman