1 Allergy Service, Hospital General Universitario Gregorio Marañón, Madrid, Spain; Gregorio Marañón Health Research Institute (IiGSM), Madrid, Spain.
2 Allergy Service, Hospital General Universitario Gregorio Marañón, Madrid, Spain; Gregorio Marañón Health Research Institute (IiGSM), Madrid, Spain; Biomedical Research Network on Rare Diseases (CIBERER)-U761, Madrid, Spain.
3 Allergy Service, Hospital General Universitario Gregorio Marañón, Madrid, Spain; Gregorio Marañón Health Research Institute (IiGSM), Madrid, Spain. Electronic address: sonsoles.infante@salud.madrid.org.