Tzu-I Sung, Pau-Chung Chen, Lukas Jyuhn-Hsiarn Lee, Yi-Ping Lin, Gong-Yih Hsieh and Jung-Der Wang*
* Corresponding author: Jung-Der Wang jdwang@ntu.edu.tw
BMC Public Health 2007, 7:102 doi:10.1186/1471-2458-7-102