Villalpando, Jorge, et al. “Inducible Laryngeal Obstruction Vocal Cord Dysfunction and the Role It Plays in Refractory Asthma”. Archives of Asthma, Allergy and Immunology, vol. 1, no. 1, Aug. 2017, pp. 036-9, doi:10.29328/journal.aaai.1001005.