Geertsema, Albert A In vivo measurements of an improved tracheostoma valve based on inhalation. [electronic resource] - The Annals of otology, rhinology, and laryngology Feb 2002 - 142-8 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 0003-4894 Standard No.: 10.1177/000348940211100206 doi Subjects--Topical Terms: Equipment DesignHumansIn Vitro TechniquesLaryngectomy--rehabilitationLarynx, ArtificialPulmonary VentilationRespirationSpeechTracheostomy--instrumentation