[1] Fanzeres Family Hlth Unit, Gondomar, Portugal
[2] Univ Minho, Sch Hlth Sci, Life & Hlth Sci Res Inst ICVS, Braga, Portugal
[3] ICVS 3Bs PT Govt Associate Lab, Braga, Guimaraes, Portugal
[4] Horizonte Family Hlth Unit, Oporto, Portugal
[5] Univ Hosp Montpellier, Montpellier, France
[6] Ctr Imunoalergol CUF, Lisbon, Portugal
[7] Univ Cagliari, Dept Med Sci M Aresu, I-09124 Cagliari, Italy
[8] Hop Arnaud de Villeneuve, Univ Hosp, Dept Resp Dis, Montpellier, France
[9] Helsinki Univ Hosp, Skin & Allergy Hosp, Dept Allergy, Helsinki, Finland
[10] Univ Porto, Fac Med, Ctr Imunoalergol CUF, CINTESIS, P-4100 Oporto, Portugal
[11] Univ Porto, Fac Med, Ctr Imunoalergol CUF, Hlth Informat & Decis Sci Dept, P-4100 Oporto, Portugal
[12] Univ London Imperial Coll Sci Technol & Med, Royal Brompton & Harefield Fdn NHS Trust, Natl Heart & Lung Inst, London, England
[13] Univ Groningen, Univ Med Ctr Groningen, Dept Gen Practice, Groningen, Netherlands
[14] Hosp CUF Descobertas, Ctr Imunoalergol, Lisbon, Portugal
[15] Univ Porto, Fac Med, Hlth Informat & Decis Sci Dept, P-4100 Oporto, Portugal
[16] Ctr Hosp S Joao, Serv Imunoalergol, Oporto, Portugal
[17] IB Salut, Son Pisa Primary Care Hlth Ctr, Palma De Mallorca, Spain
[18] Hosp Serv Publ Estadual Sao Paulo, Allergy & Immunol Sect, Sao Paulo, Brazil
[19] Agia Barbara Hlth Care, Iraklion, Crete, Greece
[20] Akdeniz Univ, Dept Family Med, TR-07058 Antalya, Turkey
[21] Olmsted Med Ctr, Dept Res, Rochester, MN USA
[22] Univ Porto, Fac Med, CINTESIS, P-4100 Oporto, Portugal
[23] Ctr Imunoalergol CUF, Oporto, Portugal