2 Allergy and Pneumology Department, Hospital de la Santa Creu i Sant Pau, Sant Pau Biomedical Research Institute (IIB Sant Pau), Autonomous University of Barcelona (UAB), Barcelona, Spain. Electronic address: sotoretes@gmail.com.
3 Pneumology Section, Hospital Universitari San Juan d'Alacant, Alicante, Valencia, Spain.
4 Pulmonology Department, Hospital Universitario de la Princesa, Instituto de Investigación Biomédica La Princesa (IP), Madrid, Spain.