1. Physiology Department, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
2. Physiology Department, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain and Clinical Physiology Department, Faculty of Medicine, Menoufia University, Menoufia, Egypt
3. Pediatrics Department, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain and Head of Examination Unit, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain