1. Department of Cardiothoracic Surgery/Cardiac Anaesthesia & ICU Section, Heart Hospital, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar
2. Department of Critical Care Medicine, Beni-Suef University, P.O. Box 62511, Beni-Suef, Egypt
3. Department of Anesthesia, Suez Canal University, P.O. Box 351-41511, Ismailia, Egypt
4. Department of Anesthesia, Ain Shams University, Kasr-El-Zaafaran, P.O. Box 11566, Cairo, Egypt
5. Department of Cardiology Research Centre, Hamad Medical Corporation, P.O. Box 3050, Doha, Qatar