[1] HEBREW UNIV JERUSALEM,HADASSAH MED CTR,DEPT OPHTHALMOL,JERUSALEM,ISRAEL
[2] WISTAR INST ANAT & BIOL,MULTIPLE SCLEROSIS RES CTR,PHILADELPHIA,PA 19104
[3] UNIV PENN,SCH MED,DEPT NEUROL,PHILADELPHIA,PA 19104
[4] HEBREW UNIV JERUSALEM,HADASSAH MED CTR,DEPT MOLEC VIROL,JERUSALEM,ISRAEL