TY - JOUR T1 - Corrigendum JF - British Journal of Ophthalmology JO - Br J Ophthalmol SP - 191 LP - 191 DO - 10.1136/bjo.37.3.191 VL - 37 IS - 3 A2 - , Y1 - 1953/03/01 UR - http://bjo.bmj.com/content/37/3/191.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -