[1] MD Barbantini Clin, Angiol Dept, Via Calcio 2, I-55100 Lucca, Italy
[2] Euroctr Venalinfa, I-63074 San Benedetto Tronto, AP, Italy
[3] Italian Natl Res Council, Inst Clin Physiol, I-56100 Pisa, Italy
[4] CNR, I-56100 Pisa, Italy
[5] Med Univ Vienna, Dept Dermatol, A-1010 Vienna, Austria