1. 1Department of Epidemiology and Public health, College of Medicine and Health Sciences, National University of science and technology, Sultanate of Oman.
2. 2Department of Medicine, College of Medicine and Health Sciences, National University of science and technology, Sultanate of Oman.
3. 3Department of Pharmacy Practice, College of Pharmacy, King Saud bin Abdulaziz University of health sciences, Saudi Arabia.
4. 4Department of Community Medicine, Government medical college Thiruvananthapuram, Kerala, India.