[1] UNIV FLORENCE,DIV CLIN IMMUNOL,I-50121 FLORENCE,ITALY
[2] UNIV FLORENCE,BACTERIOL & VIROL LAB,I-50121 FLORENCE,ITALY
[3] UNIV FLORENCE,INST ODONTOL & STOMATOL,I-50121 FLORENCE,ITALY
[4] UNIV CALIF LOS ANGELES,DEPT PATHOL,LOS ANGELES,CA 90024
[5] UNIV TEXAS,SW MED CTR,DIV DERMATOPATHOL,DALLAS,TX 75230