Maximum Phonation Time: Variability and Reliability von Speyer, Renée, Bogaardt, Hans C.A, Passos, Valéria Lima, Roodenburg, Nel P.H.D, Zumach, Anne, Heijnen, Mariëlle A.M, Baijens, Laura W.J, Fleskens, Stijn J.H.M, Brunings, Jan W

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