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source:Source: https://open.alberta.ca/dataset/9920ec0c-7ddf-4124-953a-e0b9b3a298b1/resource/7650086a-416d-4e7a-9436-07abbe0e9c5b/download/4225984-2008-physicians-guide-to-occupational-health-and-safety-responsibilities-changed-2011.pdf