GBD 2013 Risk Factors Collaborators (Including: Uthman, Olalekan A.). (2016) Global, regional, and national comparative risk assessment of 79 behavioural, environmental and occupational, and metabolic risks or clusters of risks, 1990-2015 : a systematic analysis for the Global Burden of Disease Study 2015. Lancet Neurology, 388 (10053). pp. 1659-1724. doi:10.1016/S0140-6736(15)00128-2 ISSN 1474-4422.