(1998). Ergonomic conditions and voice: Paper presented at PEVOC-II conference, August 29-31 1997, in Regensburg, Germany. Logopedics Phoniatrics Vocology: Vol. 23, No. 1, pp. 11-19.
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Eija-Riitta Lauri Erkki Vilkman (1998) studied this question.
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