1. Department of Internal Medicine, Pakistan Atomic Energy Commission General Hospital, Sector H -11/4 Islamabad, Pakistan
2. Sorbonne Université and INSERM, Pierre Louis Institute of Epidemiology and Public Health (IPLESP UMRS 1136), Epidemiology of Allergic and Respiratory Diseases Department (EPAR), Faculty of Medicine, SaintAntoine Medical School, Paris, France
3. Department of Community Medicine, Al-Nafees Medical College, Isra University, Islamabad Campus, Islamabad, Pakistan
4. Department of Medicine, Shaheed Mohtarma Benazir Bhutto Medical University, Larkana, Pakista