1. Cardiac Surgery Division, Cardiac Sciences Department, College of Medicine, King Fahad Cardiac Center, King Saud University Medical City, King Saud University, Riyadh, Saudi Arabia
2. Cardiothoracic Surgery Department, Tanta University, Tanta, Egypt
3. Department of Adult Cardiac Surgery, Prince Sultan Cardiac Center, Prince Sultan Military Medical City, Riyadh, Saudi Arabia
4. Department of Research, Prince Sultan Cardiac Center, Prince Sultan Military Medical City, Riyadh, Saudi Arabia