Department of Anaesthesia, Hamad General Hospital, Doha, Qatar. Clinical Research, Trauma & Vascular Surgery Section, Hamad Medical Corporation, Doha, Qatar. Department of Surgery, Trauma &Vascular Surgery Section, Hamad Medical Corporation, Doha, Qatar. Clinical Research, Trauma & Vascular Surgery Section, Hamad Medical Corporation, Doha, Qatar; Clinical Medicine, Weill Cornell Medical College, Doha, Qatar. Electronic address: aymanco65@yahoo.com.