1. United States, Title 42: Public Health §8:12 federal opioid treatment standards. electronic Code of Federal Regulations, e-CFR. http://ecfr.gpoaccess.gov/cgi/t/text-idx?c=ecfr&sid=0ff8339b2448e734fd172509105. June 2009.
2. Data supplied by the American Association of Poison Control Centers (2009) from the National Poison Data System.