[1] UNIV PITTSBURGH,SCH MED,EYE & EAR INST PITTSBURGH,DEPT HUMAN GENET,PITTSBURGH,PA 15213
[2] ANIM HLTH TRUST,COMPARAT OPHTHALMOL UNIT,NEWMARKET CB8 7PN,SUFFOLK,ENGLAND
[3] UNIV PITTSBURGH,GRAD SCH PUBL HLTH,PITTSBURGH,PA 15213
[4] SWEDISH UNIV AGR SCI,DEPT MED & SURG,S-75007 UPPSALA,SWEDEN
[5] INDIANA UNIV,DEPT OPHTHALMOL,INDIANAPOLIS,IN 46204