Authors: Xing Lin Feng; Evropi Theodoratou; Li Liu; Kit Yee Chan; David Hipgrave; Robert Scherpbier; Hana Brixi; Sufang Guo; Wen Chunmei; Mickey Chopra; Robert E Black; Harry Campbell; Igor Rudan; Yan Guo Journal: J Glob Health Date: 2012-06 Impact factor: 4.413