[1] UNIV PAVIA,I-27100 PAVIA,ITALY
[2] UNIV REGGIO CALABRIA,DEPT PEDIAT,CATANZARO,ITALY
[3] NAPLES UNIV,DEPT PEDIAT,I-80138 NAPLES,ITALY
[4] UNIV TEXAS,HLTH SCI CTR,SAN ANTONIO,TX 78284
[5] CATHOLIC UNIV NIJMEGEN,DEPT HUMAN GENET,NIJMEGEN,NETHERLANDS
[6] UNIV CAMBRIDGE,DEPT PATHOL,CAMBRIDGE,ENGLAND
[7] IST GIANNINA GASLINI,I-16148 GENOA,ITALY