References: Malignant central airway obstruction in palliative care
Mallow C, Hayes M, Semaan R, Smith T, Hales R, Brower R, et al. Minimally invasive palliative interventions in advanced lung cancer. Expert Rev Respir Med 2018;12(7):605-14. https://www.ncbi.nlm.nih.gov/pubmed/29883216