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1 School of Public Health, Sun Yat-sen University, Guangzhou 510080, China;
2 Community Health Service Center of Sanxiang Town, Zhongshan 528400, China;
3 Community Health Service Center of Dongfeng Town, Zhongshan 528425, China;
4 Institute for Prevention & Control of Non-Communicable Chronic Diseases, Zhongshan Center for Disease Control and Prevention, Zhongshan 528403, China;
5 Community Health Service Center, Shawan Street, Panyu District, Guangzhou 511483, China
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