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Men who have sex with men (MSM) may account for an increasing proportion of China’s HIV epidemic, but remain difficult to access for epidemiological studies due to high stigma. We compare the composition of two samples of MSM obtained in Guangzhou, China. The first survey, conducted in 2004, recruited MSM through convenience sampling. The second survey in(More)
OBJECTIVES To assess the impact of exposure to ambient heat on urolithiasis among outdoor workers in a subtropical city of China. METHODS The 2003-2010 health check data of a shipbuilding company in Guangzhou, China were acquired. 190 cases and 760 matched controls were involved in this study. We assessed the relationship between exposure to ambient heat(More)
OBJECTIVE To describe the epidemiological characteristics of nonfatal child pedestrian injuries and provide information to help understand an important public-health problem. METHODS This was a school-based, cross-sectional questionnaire survey. The sample (42 750 children) was obtained from two urban cities of Guangdong Province, China, using multi-stage(More)
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