Phenotyping asthma with airflow obstruction in middle-aged and older adults: a CADSET clinical research collaboration - Bertels, Xander; Edris, Ahmed; Garcia-Aymerich, Judith; Faner, Rosa; Meteran, Howraman; Sigsgaard, Torben; Alter, Peter; Vogelmeier, Claus; Olvera, Nuria; Kermani, Nazanin Zounemat; Agusti, Alvar; Donaldson, Gavin C.; et al. (BMJ Open Respiratory Research, 2023)