Open Access Research article

Detection of air trapping in chronic obstructive pulmonary disease by low frequency ultrasound

Katrin Morenz, Heike Biller, Frank Wolfram, Steffen Leonhadt, Dirk Rüter, Thomas Glaab, Stefan Uhlig* and Jens M Hohlfeld

BMC Pulmonary Medicine 2012, 12:8  doi:10.1186/1471-2466-12-8

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