S. B Park, K. R Sung, S. Y Kang, K. R Kim and M. S. Kook
Archives of Ophthalmology 127 ( 12 ): 1603 - 1609 , 2009
S. Y Kang, D Howard, J Kim, J. S Payne, L Wilton, W Kim and D. Maramba
Journal of Public Health 32 ( 3 ): 431 - 439 , 2010