Global burden of hypoglycaemia-related mortality in 109 countries, from 2000 to 2014: an analysis of death certificates 
Zaccardi F, Dhalwani N, Webb D, Davies M, Khunti K
Diabetologia  july 2018 (61):1592–1602
https://doi.org/10.1007/s00125-018-4626-y