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Health Behaviour in School-aged Children (HBSC), a WHO collaborative cross-national study, has provided information about the health, well-being, social environment and health behaviour of 11-, 13- and 15-year-old boys and girls for over 30 years. This latest international report from the study presents findings from the 2013/2014 survey, which collected data from almost 220 000 young people in 42 countries in Europe and North America. …