[1] IRCCS, Fdn S Maugeri, Ctr Med Riablilitaz, Div Pneumol, I-27040 Pavia, Italy
[2] Osped Reg Umberto I, Ancona, Italy
[3] Osped Civ Renzetti, Chieti, Italy
[4] Osped Mauriziano Umberto 1, Turin, Italy
[5] Osped Antonio Cardarelli, Naples, Italy
[6] Osped Policlin S Orsola, Bologna, Italy
[7] Univ Perugia, I-06100 Perugia, Italy
[8] Univ Padua, Ist Med Lavoro, I-35127 Padua, Italy
[9] USL Le8, Lecce, Italy
[10] Osped Armanni, Trento, Italy
[11] Osped Prov Mazzoni, Ascoli Piceno, Italy
[12] Osped Civile San Martino, Genoa, Italy
[13] Osped S Michele, Cagliari, Italy
[14] Clin Univ Firenze, Osped Careggi Cattedra Immunol, Florence, Italy
[15] USL 21, Padua, Italy
[16] Policlin Padigl H, Sch Allergy & Clin Immunol, Messina, Italy
[17] Univ Cattolica Sacro Cuore, Clin Columbus, Rome, Italy
[18] Osped Civile Busto Arsizio, Varese, Italy
[19] Nuovo Osped S Giovanni di Dio, Florence, Italy