Qatar Medical Journal (ISSN: 0253-8253, ESSN: 2227-0426) RoMEO: This is a RoMEO green journal Author's Pre-print: green tick author can archive pre-print (ie pre-refereeing);Author's Post-print: green tick author can archive post-print (ie final draft post-refereeing) Publisher's Version/PDF: green tick author can archive publisher's version/PDF General Conditions: On open access repositories Creative Commons Attribution License 3.0 Publisher's version/PDF may be used Lyn 26/8/16