@article {Carvalho763, author = {Paula G Carvalho}, title = {Principles and Practice of Sleep Medicine, 4th edition.}, volume = {52}, number = {6}, pages = {763--764}, year = {2007}, publisher = {Respiratory Care}, issn = {0020-1324}, URL = {https://rc.rcjournal.com/content/52/6/763}, eprint = {https://rc.rcjournal.com/content/52/6/763.full.pdf}, journal = {Respiratory Care} }