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F survey. FP prepared the protocol and sought ethics approval from Shandong University. CSH performed the literature review and wrote the introduction. YL and RCMH performed the statistical analysis and designed data presentation. All authors read and approved the final manuscript.Ho et al. BMC Psychiatry 2014, 14:81 http://www.biomedcentral.com/1471-244X/14/Page 8 ofAuthor details 1 Southeast Asi