Hussain A
From the Department of Medicine, Allama Iqbal Medical College, Lahore (RQ, HM, ZT, AAH, IS), Department of Medicine, Baqai Medical University, Karachi, Pakistan (MR), Department of Medicine, University of Nevada Las Vegas Kirk Kerkorian School of Medicine, Las Vegas, Nevada, USA (KM, A-BA), Department of Medicine, Jinnah Hospital Lahore, Lahore, Pakistan (BH), Faculty of Medicine, Kabul University of Medical Sciences 'Abu Ali Ibn Sina', Kabul, Afghanistan (HA), Chitwan Medical College, Bharatpur, Nepal (AH).