The meta-analysis and forest plot presentation of the HBsAg seroprevalence from 1983 to 2015. (Citations of studies used in the analysis from top to bottom: [9, 10, 13, 16, 17, 25–27, 29–35, 38, 39, 42, 43, 53, 54, 57, 59, 62–65, 67, 85, 87–90, 92, 93, 95–97])