Among the 139 subjects who remembered receiving the questionnaire, reasons for their lack of response were varied: 91 66 percent reported not responding for personal or subjective reasons, 26 19 percent considered themselves ineligible, 21 15 percent claimed to have completed the questionnaire and mailed it, and one declined to answer the question.
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Most of the cadmium in the environment occurs from activities such as mining, smelting, and refining metal ores — especially zinc, lead and copper.