Keep up to date with the latest news and content from BMC Public Health and BioMed Central.
Xiaoqian Liu, Changping Li, Hui Gong, Zhuang Cui, Linlin Fan, Wenhua Yu, Cui Zhang and Jun Ma*
Corresponding author: Jun Ma firstname.lastname@example.org
BMC Public Health 2013, 13:729
Fields marked * are required
BioMed Central Ltd unless otherwise stated. Part of Springer Science+Business Media.