S. C Chen, Y. T Lee, C. H Yen, K. C Lai, L. B Jeng, D. B Lin, P. H Wang, C. C Chen, M. C Lee and W. R. Bell
Age and Ageing 38 ( 3 ): 271 - 276 , 2009
S. C Wang, S. H Lee, M. C Lee and L. Wang
Journal of Public Health 31 ( 3 ): 406 - 412 , 2009