[1] Univ Lisbon, Fac Med, Microbiol Res Lab Environm Hlth EnviHlth Micro L, Inst Environm Hlth ISAMB, P-1649028 Lisbon, Portugal
[2] Univ Lisbon, Inst Prevent Med & Publ Hlth, Fac Med, P-1649028 Lisbon, Portugal
[3] Nippon Gases Portugal, Healthcare Dept, P-2600242 Vila Franca De Xira, Portugal
[4] Univ Porto, Ctr Hlth Technol & Serv Res CINTESIS, Fac Med, P-4200450 Porto, Portugal
[5] Univ Porto, Dept Community Med Informat & Hlth Decis Sci MEDC, Fac Med, P-4200450 Porto, Portugal
[6] Univ Porto, Dept Med, Fac Med, P-4200319 Porto, Portugal
[7] Ctr Hosp Univ Sao Joao CHUSJ, Dept Rheumatol, P-4200319 Porto, Portugal
[8] Hosp Quiron Salud San Jose, Healthcare Management Dept, Madrid 28002, Spain
[9] Inst & Hosp CUF Porto, Allergy Unit, P-4460188 Matosinhos, Portugal
[10] Nippon Gases Spain, Healthcare Dept, Madrid 28020, Spain
[11] Hosp Univ Moncloa, Serv Pneumol, Madrid 28008, Spain
[12] Hosp Clin Barcelona, Programa Atenc Cronicidad, Barcelona 08036, Spain
[13] Master Plan Resp Dis Minist Hlth, Barcelona 08028, Spain
[14] Observ Home Resp Therapies FORES, Barcelona 08028, Spain
[15] Inst Salud Carlos III, REDISSEC Hlth Serv Res Chron Patients Network, Madrid 28029, Spain