[1] Johns Hopkins Univ, Sch Med, Baltimore, MD 21218 USA
[2] Univ Texas San Antonio, San Antonio, TX USA
[3] South Texas Vet Hlth Care Syst, San Antonio, TX USA
[4] Odense Univ Hosp, Odense C, Denmark
[5] Univ Paris 05, Sorbonne Paris Cite, Hop Cochin, AP HP,Serv Pneumol, Paris, France
[6] Univ Liverpool, Inst Ageing & Chron Dis, Liverpool, Merseyside, England