1. United Nations Office on Drugs and Crime (UNODC). Global Study on Homicide: Trends, Context, Data. Vienna: UNODC; 2011
2. ARQs that were more than 50 per cent completed were classified as having been 'substantially filled in'; less than 50 per cent completion is classified as having been 'partially' filled in. See: United Nations Office on Drugs and Crime;World Drug Report,2012