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Respirator for stone crushers

We determined the prevalence of respiratory symptoms, pulmonary function and urinary metals among artisanal stone-crushers. We conducted a cross-sectional study of 48 male artisanal stone-crushers and 50 male taxi-drivers using a standardised questionnaire and spirometry. Concentrations of trace metals were measured by inductively coupled plasma - mass spectrometry (ICP-MS) in urine spot

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