Abdul Rehman1, Muhammad Awais2, Noor Ul-Ain Baloch3. 1. Section of Internal Medicine, Department of Medicine, Hamad Medical Corporation, Doha, Qatar2Department of Biological and Biomedical Sciences, The Aga Khan University, Karachi, Pakistan. 2. Department of Radiology, The Aga Khan University Hospital, Karachi, Pakistan. 3. Department of Biological and Biomedical Sciences, The Aga Khan University, Karachi, Pakistan.