@article {Heffner268, author = {John E Heffner}, title = {Fishman{\textquoteright}s Pulmonary Diseases and Disorders, 4th edition.}, volume = {54}, number = {2}, pages = {268--269}, year = {2009}, publisher = {Respiratory Care}, issn = {0020-1324}, URL = {https://rc.rcjournal.com/content/54/2/268}, eprint = {https://rc.rcjournal.com/content/54/2/268.full.pdf}, journal = {Respiratory Care} }