[1] Fdn S Maugeri, WHO Collaborating Ctr TB & Lung Dis, Care & Res Inst, Tradate, Italy
[2] Univ Insubria, Dept Clin & Expt Med, Varese, Italy
[3] Otsuka SA, Geneva, Switzerland
[4] Univ Sassari, Epidemiol & Med Stat Unit, Dept Biomed Sci, I-07100 Sassari, Italy