[1] Aravind Eye Hosp, Pondicherry, India
[2] Johns Hopkins Univ, Dana Ctr Prevent Ophthalmol, Baltimore, MD USA
[3] Johns Hopkins Univ, Wilmer Eye Inst, Baltimore, MD USA
[4] Aravind Eye Hosp, Tirunelveli, India
[5] Aravind Eye Hosp, Coimbatore, Tamil Nadu, India
[6] Aravind Eye Hosp, Madurai, Tamil Nadu, India