1. Specialty Medicine Department, John Hopkins Aramco Health Care, Dhahran, Saudi Arabia
2. College of Medicine, King Saud bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia
3. King Abdullah International Medical Research Center, Riyadh, Saudi Arabia
4. Department of Medicine, King Abdulaziz Medical City, Ministry of National Guard Health Affairs, Riyadh, Saudi Arabia
5. College of Science, King Saud University, Riyadh, Saudi Arabia