1. College of Medicine, King Faisal University, Al Ahsa, Saudi Arabia
2. Department of Internal Medicine, King Fahd Hospital of the University (Imam Abdulrahman Bin Faisal University), Al Khobar, Saudi Arabia
3. Department of Microbiology, King Fahd Hospital of the University (Imam Abdulrahman Bin Faisal University), Al Khobar, Saudi Arabia