[1] UMDAI, Allergy Unit, Valladolid, Spain
[2] UMDAI, Res Unit, IEN, Valladolid, Spain
[3] UMDAI, Rio Hortega Univ Hosp, Clin Chem Serv, Valladolid, Spain
[4] DIATER Labs, Madrid, Spain
[5] Hosp Virgen de la Macarena, Allergy Serv, Seville, Spain
[6] Grp Ferrer, Barcelona, Spain