13. Hsu, W. M., Cheng, C. Y., Liu, J. H., Tsai, S. Y., and Chou, P. (2004) Prevalence and causes of visual impairment in an elderly Chinese population in Taiwan: the Shihpai Eye Study. Ophthalmology 111, 62-69

13. Hsu, W. M., Cheng, C. Y., Liu, J. H., Tsai, S. Y., and Chou, P. (2004) Prevalence and causes of visual impairment in an elderly Chinese population in Taiwan: the Shihpai Eye Study. Ophthalmology 111, 62-69