1. Department of General Surgery, CMH Muzaffarabad, Azad Kashmir, Pakistan
2. Department of General Surgery, Liaquat National Hospital and Medical College, Karachi, Pakistan
3. Department of Nephrology, Dow University of Health Sciences, Karachi, Pakistan
4. Department of Internal Medicine, Dow University of Health Sciences, Karachi, Pakistan
5. Teaching Assistant, Faculty of Medicine, University of Bakht Al-Ruda, Khartoum, Sudan
6. Department of Medicine, Baylor College of Medicine, Houston, TX
7. Division of Nephrology and Hypertension, Mayo Clinic-Rochester, Rochester, MN.