1. Gray KM, Squeglia LM. Research review: what have we learned about adolescent substance use? J Child Psychol Psychiatry. 2018;59:618–27.
2. Tam CL, Foo YC. A qualitative study on drug abuse relapse in Malaysia: contributory factors and treatment effectiveness. Int J Collab Res Intern Med Public Health. 2013;5:217–32.
3. Gobel K, Scheithauer H, Braker AB, Jonkman H, Soellner R. Substance use patterns among adolescents in Europe: a latent class analysis. Subst Use Misuse. 2016;51:1130–8.
4. Johnston LD, O’Malley PM, Miech RA, Bachman JG, Schulenberg JE. Monitoring the future National Survey Results on drug use: 1975-2016: overview, key findings on adolescent drug use. Ann Arbor: Institute for Social Research, The University of Michigan; 2017.
5. NIDA. Health Consequences of Drug Misuse.: National Institute on Drug Abuse website. March 23, 2017. Retrieved from
https://www.drugabuse.gov/related-topics/health-consequences-drug-misuse
. Accessed 1 July 2018.