[1] Ludwig Boltzmann Inst Lung Hlth, Vienna, Austria
[2] Maastricht Univ, Care & Publ Hlth Res Inst, Fac Hlth Med & Life Sci, Vienna, Austria
[3] Vienna Healthcare Grp, Dept Resp & Pulm Dis, Clin Penzing, Vienna, Austria
[4] Maastricht Univ, Maastricht, Netherlands
[5] Sigmund Freud Univ, Fac Med, Vienna, Austria
[6] Maastricht Univ, Dept Hlth Serv Res, Maastricht, Netherlands
[7] Maastricht Univ, Care & Publ Hlth Res Inst, Dept Family Med, Fac Hlth Med & Life Sci, Maastricht, Netherlands
[8] Horn Netherlands, Dept Res & Dev, Ciro, Maastricht, Netherlands
[9] Imperial Coll London, Natl Heart & Lung Inst, London, England
[10] St Marys Hosp, NIHR Imperial Biomed Res Ctr, London, England