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Müller, Gabi; Bersch-Porada, Ines; Koch-Borner, Sabrina; Raab, Anja; Jonker, Marga; Baumberger, Michael; Michel, Franz (2014). Laboratory Evaluation of Four Different Devices for Secretion Mobilization: Acapella Choice, Green and Blue Versus Water Bottle Respiratory Care, 59(5), pp. 673-677. American Association for Respiratory Care 10.4187/respcare.02654
