[1] Politecn Milan, I-20133 Milan, Italy
[2] CNS, Rome, Italy
[3] Ctr Transfus Rome, Rome, Italy
[4] Univ Minnesota, Minneapolis, MN USA
[5] McMaster Univ, Hamilton, ON, Canada
[6] Ctr Transfus Verona, Verona, Italy
[7] Ctr Transfus Naples, Naples, Italy
[8] Ctr Trasfus Pavia, Pavia, Italy