[1] Univ Louisville, Louisville, KY 40292 USA
[2] Hackensack Univ Med Ctr, Hackensack, NJ USA
[3] Northeastern Ohio Univ Coll Med & Pharm, Akron, OH USA
[4] Johannesburg Hosp, Johannesburg, South Africa
[5] Hosp S Maria Misericordia, Udine, Italy
[6] Univ Milan, Inst Resp Dis, I-20122 Milan, Italy
[7] Univ Alberta Hosp, Edmonton, AB T6G 2B7, Canada
[8] Hosp Maisonneuve Rosemont, Montreal, PQ, Canada
[9] Hosp Clin Jose San Martin, Buenos Aires, DF, Argentina
[10] Inst Med Platense, La Plata, Buenos Aires, Argentina
[11] Inst Nacl Torax, Santiago, Chile
[12] Hosp Sant Pau & Santa Tecla, Tarragona, Spain
[13] Hop Univ Caracas, Caracas, Venezuela
[14] City Hosp Ev Behring, Lungenklin, Heckeshorn, Germany