Methodology Employed to Develop the Airway Mucus Secretion Test (T-SEC): A Questionnaire to Evaluate Airway Mucus Hypersecretion in Patients With Asthma Esther Palones; Juan Luis García-Rivero; Carolina Cisneros; Carlos Almonacid-Sánchez; Luis Pérez-de Llano; Vicente Plaza; Astrid Crespo-Lessmann;