RT Journal Article SR Electronic T1 Trachoma JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 601 OP 606 DO 10.1136/bjo.35.10.601 VO 35 IS 10 A1 de Andrade, Lopes YR 1951 UL http://bjo.bmj.com/content/35/10/601.abstract AB