1. Opioid receptors, continuing education in anaesthesia;McDonald;Cri. Care Pain,2005
2. Increases in drug and opioid-involved overdose deaths—United States, 2010–2015: MMWR;Rudd;Morbid. Mortal. Wkly. Rep.,2016
3. United Nations Office on Drugs and Crime, World drug report 2017: Global overview of drug demand and supply, 2017. 10.18356/bdc264f4-en.
4. EMCDDA, European Drug Report 2017: Trends and Developments, 2017. 10.2810/88175.
5. Illicit drugs, a novel group of environmental contaminants;Zuccato;Water Res.,2008