Pei-Chia Chang , Tsai-Chung Li , Ming-Tsang Wu , Chiu-Shong Liu , Chia-Ing Li , Ching-Chu Chen , Wen-Yuan Lin , Shin-Yuh Yang and Cheng-Chieh Lin
BMC Public Health 2008, 8:193doi:10.1186/1471-2458-8-193
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