Correction
Correction: Physiotherapy and intermittent positive-pressure ventilation of chronic bronchitis
Br Med J 1978; 2 doi: https://doi.org/10.1136/bmj.2.6153.1684-a (Published 16 December 1978) Cite this as: Br Med J 1978;2:1684This is a PDF-only article. The first page of the PDF of this article appears above.