1. Pharmacy Department, Hamad Medical Corporation , Doha , Qatar
2. Internal Medicine Department, Rochester Regional Health – Unity Hospital , New York , USA
3. Internal Medicine Department, Hamad Medical Corporation , Doha , Qatar
4. Critical Care Department, Hamad Medical Corporation , Doha , Qatar
5. Heart Failure Department, Hamad Medical Corporation , Doha , Qatar
6. Nephology Department, Hamad Medical Corporation , Doha , Qatar
7. Urology and Nephrology Center, Faculty of Medicine, Mansoura University , Mansoura , Egypt