Keep up to date with the latest news and content from BMC Public Health and BioMed Central.
Juan Sun*, He Yi, Zhiyue Liu, Yan Wu, Jiang Bian, Yanyan Wu, Yuki Eshita, Gaimei Li, Qing Zhang and Ying Yang
Corresponding author: Juan Sun email@example.com
BMC Public Health 2013, 13:42
BioMed Central Ltd unless otherwise stated. Part of Springer Science+Business Media.