[1] MOSCOW PEDIAT INST,MOSCOW,USSR
[2] NAPLES UNIV,I-80138 NAPLES,ITALY
[3] FREDERICK CANC RES & DEV CTR,DYNCORP,PROGRAM RESOURCES INC,BIOL CARCINOGENESIS DEV PROGRAM,FREDERICK,MD
[4] LENINGRAD OBSTET INST,LENINGRAD,USSR
[5] HAHNEMANN UNIV,PHILADELPHIA,PA 19102
[6] COLUMBIA UNIV,MED CTR,NEW YORK,NY 10027
[7] MM SHEMYAKIN BIOORGAN CHEM INST,MOSCOW 117312,USSR