PT - JOURNAL ARTICLE AU - Teresa A Volsko TI - The Value of Conducting Laboratory Investigations on Airway Clearance Devices DP - 2008 Mar 01 TA - Respiratory Care PG - 311--313 VI - 53 IP - 3 4099 - http://rc.rcjournal.com/content/53/3/311.short 4100 - http://rc.rcjournal.com/content/53/3/311.full