Follicle size in trachoma: assessment of a well-known trachoma grading diagram
Daniel P Morberg, Abdou Amza, Sintayehu Gebresillasie, Zerihun Tadesse, Sun N Yu, Nicole E Stoller, Paul M Emerson, Bruce D Gaynor, Thomas M Lietman, Jeremy D Keenan
British Journal of Ophthalmology May 2014, 98 (5) 706-708; DOI: 10.1136/bjophthalmol-2013-304810