1. Reynolds, H. Y., 1983, Altered lung host defenses and infection, in: Respiratory Infections: Diagnosis and Management (J. E. Pennington, ed.), Raven, New York, pp. 1–23.
2. Rutland, W., Griffin, M., and Cole, P. J., 1982, Human ciliary beat frequency in epithelium from intrathoracic and extrathoracic airways, Am. Rev. Respir. Dis. 125:100–105.
3. Wanner, A., 1977, Clinical aspects of mucociliary transport (state of the art), Am. Rev. Respir. Dis. 116:73–125.
4. Reid, L., 1965, Natural history of mucus in the bronchial tree. Arch. Environ. Health. 10: 265–272.
5. Toremalm, N. G., 1960, The daily amount of tracheobronchial secretions in man. Acta Otolaryngol (Suppl). 158:43–46.