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1Assistant Professor Department of Public Health School of Medicine University of Barcelona, Spain 2Chief of Section of Otorhinolaryngology Department of Occupational Medicine National Institute for Occupational Safety and Hygiene Barcelona, Spain 3Chief of Department of Occupational Medicine National Institute for Occupational Safety and Hygiene Barcelona, Spain 4Chairman Department of Public Health School of Medicine University of Barcelona, Spain
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Sánz et al. (1989) studied this question.
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