1. Aldrich MR (2012) Antique cannabis book, medical cannabis: a short graphical history, http://antiquecannabisbook.com/chap1/Shaughnessy.htm [Accessed on 12 Oct 2013]
2. ΕMCDDA (European Monitoring Centre for Drugs and Drug Addiction) (2012) Annual report: the state of the drug problem in Europe. http://www.emcdda.europa.eu/publications/annual-report/2012 [Accessed on 12 Jan 2014]
3. Kyriopoulos J, Tsiantou V (2010) Arch Hellen Med 27:834–840
4. Stuckler D, Basu S, Suhrcke M, Coutts A, McKee M (2009) Lancet 374:315–323
5. Daughton CG (2011) In: Castiglioni S, Zuccato E, Fanelli R (eds) Illicit drugs in the environment: occurrence, analysis and fate using mass spectrometry. Canada, Wiley