PT - JOURNAL ARTICLE AU - Tamhane Ashutosh AU - Gerald McGwin TI - Case–control or cohort study? AID - 10.1136/bjo.2011.203141 DP - 2011 Aug 01 TA - British Journal of Ophthalmology PG - 1175--1175 VI - 95 IP - 8 4099 - http://bjo.bmj.com/content/95/8/1175.1.short 4100 - http://bjo.bmj.com/content/95/8/1175.1.full SO - Br J Ophthalmol2011 Aug 01; 95