1. United Nations Office on Drugs and Crime (UNODC) World Drug Report 2016 www.unodc.org/doc/wdr2016/WORLD_DRUG_REPORT_2016_web.pdf
2. National estimates of marijuana use and related indicators-National Survey on Drug Use and Health, United States, 2002-2014;Azofeifa;MMWR Surveill Summ,2016
3. Substance Abuse and Mental Health Service Administration. Highlights of the 2011 Drug Abuse Warning Network (DAWN) findings on drug-related emergency department visits www.samhsa.gov/data/sites/default/files/DAWN127/DAWN127/sr127-DAWN-highlights.pdf
4. Genen L Cannabis-related disorders http://emedicine.medscape.com/article/286661-clinical
5. Marijuana legalization: impact on physicians and public health;Wilkinson;Annu Rev Med,2016