[1] USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134
[2] THOMAS JEFFERSON UNIV,JEFFERSON MED COLL,WILLS EYE HOSP,DEPT OPHTHALMOL,ONCOL SERV,PHILADELPHIA,PA 19107
[3] UNIV PENN,SCHEIE EYE INST,PHILADELPHIA,PA 19104
[4] UNIV FLORIDA,DEPT OPHTHALMOL,GAINESVILLE,FL 32611