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2. Massachusetts Department of Public Health. An assessment of opioid-related deaths in Massachusetts (2013–2014). Boston, MA: Commonwealth of Massachusetts, Executive Office of Health and Human Services, Department of Public Health; 2016. http://www.mass.gov/eohhs/gov/departments/dph/stop-addiction/chapter-55-overdose-assessment.html
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5. Massachusetts Department of Public Health. Number of unintentional opioid-related overdose deaths by county, MA residents: 2000–2015. Boston, MA: Commonwealth of Massachusetts, Executive Office of Health and Human Services, Department of Public Health; 2016. http://www.mass.gov/eohhs/docs/dph/stop-addiction/current-statistics/overdose-deaths-by-county-nov-2016.pdf