Perspectives Adolescents – defined by the

World Health Organization (WHO) as persons aged 10–19 years – account for 1.2 bil-lion or 18 % of the world’s population.1 Adolescence is a crucial phase in human development, with rapid psychosocial and biological changes and it is often a period of experimentation and risk-tak-ing. Health-related behaviours – such as patterns of alcohol use – affect physical and cognitive development, which can have an effect on long-term health. All these factors have implications for the types of health interventions that ado-lescents need.2 However, little is know