[1] UNIV TURIN,DIPARTIMENTO GENET BIOL & CHIM MED,SEZ GENET,I-10126 TURIN,ITALY
[2] CNR,CTR IMMUNOGENET & ISTOCOMPATABIL,TURIN,ITALY
[3] UNIV TURIN,IST DISCIPLIN PEDIAT,CATTEDRA PEDIAT,I-10100 TURIN,ITALY
[4] OSPED INFANTILE REGINA MARGHERITA,SERV PNEUMOL,I-10100 TURIN,ITALY