Incidence and underlying etiologies of bronchial secretion in terminally ill cancer patients: a multicenter, prospective, observational study  Tatsuya Morita, MD, Ichinosuke Hyodo, MD, Taisuke Yoshimi, MD, Masayuki Ikenaga, MD, Yoichiro Tamura, MD, Akitaka Yoshizawa, MD, Akira Shimada, MD, PhD, Tatsuo Akechi, MD, PhD, Isamu Adachi, MD  Journal of Pain and Symptom Management  Volume 27, Issue 6, Pages 533-539 (June 2004) DOI: 10.1016/j.jpainsymman.2003.10.012

Fig. 1 Hypothesized pathophysiology of bronchial secretion. Journal of Pain and Symptom Management 2004 27, 533-539DOI: (10.1016/j.jpainsymman.2003.10.012)