MAIN OUTCOME MEASURES:
Full article at: http://goo.gl/dcEcJy
1Department of Epidemiology and Biostatistics, School of Public Health, University of Maryland, College Park, Maryland, USA.
2Department of Epidemiology and Biostatistics, College of Public Health, Temple University, Philadelphia, Pennsylvania, USA.
3Department of Community Health Sciences, UCLA Fielding School of Public Health, Los Angeles, California, USA.
4Department of AIDS/STD Prevention, Nanning Center for Disease Control and Prevention, Nanning, Guangxi, China.
5Department of AIDS/STD Prevention, Hefei Center for Disease Control and Prevention, Hefei, Anhui, China.
6Department of Epidemiology, School of Public Health, Shandong University, Jinan, Shandon, China.
BMJ Open. 2016 May 10;6(5):e010420. doi: 10.1136/bmjopen-2015-010420.
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