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In order to determine heavy metals, after preparing the samples, first, using metal salts, standard solutions of 1000 mg/L were prepared
COPD As part of the Burden of Obstructive Lung Disease (BOLD) Initiative looking at a random sample of people over 40 in Vancouver, Canada, a questionnaire about tobacco and cannabis smoking was followed by spirometry [70]
The width of cutting is adjustable at the range of 0.1-6mm easily
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