[1] Ist Clin Sci Maugeri IRCCS, Serv Epidemiol Clin Malattie Resp, Via Roncaccio 16, I-21049 Tradate, Varese, Italy
[2] IRCCS, Ist Clin Sci Maugeri, Div Pulm Rehabil, Tradate, Italy
[3] Univ Insubria, Resp Dis, Dept Med & Surg, Tradate, Varese Como, Italy
[4] World Hlth Org Reg Off Europe, Copenhagen, Denmark
[5] Queen Mary Univ London, Barts & London Sch Med & Dent, Blizard Inst, London, England
[6] Barts Hlth NHS Trust, Royal London Hosp, Div Infect, London, England
[7] Univ Fed Rio Grande Sul UFRGS, Fac Med, Porto Alegre, RS, Brazil
[8] Publ Hlth Consulting Grp, Lugano, Switzerland
[9] Univ Virginia, Div Infect Dis & Int Hlth, Charlottesville, VA USA
[10] Galliera Hosp, Dept Infect Dis, Genoa, Italy
[11] Univ Sassari, Dept Med Surg & Expt Sci, Clin Epidemiol & Med Stat Unit, Sassari, Italy
[12] Stellenbosch Univ, Fac Med & Hlth Sci, Dept Paediat & Child Hlth, Cape Town, South Africa