Amila Ratnayake1, Sanjeewa Garusinghe2, Miklosh Bala3, Tamara J Worlton4. 1. Department of Surgery, Military Hospital Narahenpita, 08 Elvitigala Mawatha, Colombo, 00800, Sri Lanka; Uniformed Service University of the Health Sciences, 4301 Jones Bridge Rd, Bethesda, MD 20814 USA. 2. Department of Neurosurgery, National Hospital of Sri Lanka, Regent Street, Colombo 10000, Sri Lanka. 3. Department of Trauma, Hadassah- Hebrew University Medical Center, Kiryat Hadassah POB 12000, Jerusalem 91120, Israel. 4. Uniformed Service University of the Health Sciences, 4301 Jones Bridge Rd, Bethesda, MD 20814 USA; Department of Surgery, Walter Reed National Military Medical Center, 8901 Wisconsin Ave, Bethesda, MD 20889 USA. Electronic address: tamara.worlton@usuhs.edu.