The prevalence of chronic pain with an analysis of countries with a Human Development Index less than 0.9: a systematic review without meta-analysis

Abstract
(2012). The prevalence of chronic pain with an analysis of countries with a Human Development Index less than 0.9: a systematic review without meta-analysis. Current Medical Research and Opinion: Vol. 28, No. 7, pp. 1221-1229. doi: 10.1185/03007995.2012.703132