[1] AO Fatebenefratelli & Oftalm, Milan, Italy
[2] Baylor Coll Med, Houston, TX 77030 USA
[3] Vall dHebron Hosp, Barcelona, Spain
[4] Kaiser Permanente, San Diego, CA USA
[5] Hosp Prov Centenario, Rosario, Santa Fe, Argentina
[6] Merck, Whitehouse Stn, NJ USA