[1] UNIV BARCELONA, HOSP CLIN & PROVINCIAL, FAC MED, DEPT BLOOD BANK, BARCELONA 36, SPAIN
[2] UNIV BARCELONA, HOSP CLIN & PROVINCIAL, FAC MED, DEPT DERMATOL, BARCELONA 36, SPAIN
[3] UNIV BARCELONA, HOSP CLIN & PROVINCIAL, FAC MED, DEPT MED, BARCELONA 36, SPAIN