1 Allergy Service, University Hospital, Salamanca, Spain. Electronic address: lazaro@alergoasma.es.
2 Hematology Service, Biosanitary Institute of Investigation of Salamanca, Salamanca, Spain.
3 Allergy Service, University Hospital, Salamanca, Spain.
4 Pediatric Service, University Hospital, Salamanca, Spain.
5 Allergy Service, University Hospital, Salamanca, Spain; Allergy Service, Biosanitary Institute of Investigation of Salamanca, Salamanca, Spain; Department of Biomedical and Diagnostic Sciences, Salamanca Medical School, University of Salamanca, Salamanca, Spain.