Di Xue, PhD, is Professor, School of Public Health, Fu Dan University, Shanghai, P.R. China. E-mail: [email protected].
Ping Zhou, PhD, is Assistant Researcher, School of Public Health, Fu Dan University, Shanghai, P.R. China.
M. Kate Bundorf, PhD, is Associate Professor, Stanford University School of Medicine, California.
Jin Xin Huang, Master, is Head of Pharmaceutical Affairs Division, Health Department of Hubei Province, P.R. China.
Ji Le Chang, MD, is Deputy Director, Health Bureau of Gansu Province, P.R. China.
This research project was funded by a grant from the National Natural Science Foundation of China (Grant 70873023) and was approved by the institutional review board of School of Public Health, Fudan University, China (IRB Approval 08-03-0122).
The authors have disclosed that they have no significant relationship with, or financial interest in, any commercial companies pertaining to this article.