[1] Univ Hosp Vall Hebron, Pneumol, Vall Hebron Inst Recerca VHIR, Barcelona, Spain
[2] Lund Univ Hosp, Lund, Sweden
[3] Charles Univ Prague, Thomayer Hosp, Prague, Czech Republic
[4] Univ Hosp Vall Hebron, Dept Clin Biochem, Vall Hebron Inst Recerca VHIR, Barcelona, Spain