1. Asociación Para Evitar la Ceguera, No. 46 Vicente García Torres, Delegación Coyoacán, 04030 México City, Mexico
2. Bascom Palmer Eye Institute, 900 N.W. 17th Street, Miami, FL 33136, USA
3. Harkness Eye Institute, Columbia University Medical Center, 635 West 165th Street, New York, NY 10032, USA