Zhang et al. BMC Public Health 2012, 12:419 http://www.biomedcentral.com/1471-2458/12/419 Competing interests There is no conflict of interest for any of the authors. All authors had access to the data and were involved in drafting the article and revising it critically for important intellectual content. Author details 1Department of Epidemiology and Health Statistics, School of Public Health, Shandong University, PO Box 100, Jinan 250012, China. 2Health Management Center, Shandong Provincial QianFoShan Hospital, Jinan 250014, China. 3Center for Health Management, Provincial Hospital affiliated to Shandong University, Jinan, China. 4Department of Epidemiology and Biostatistics, Drexel University School of Public Health, Philadelphia, PA, USA. 5Department of Public Health Sciences, School of Medicine, University of California, Davis, Davis, CA 95616, USA. 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