Mark A Bellis1, Karen Hughes2, Sara Hughes2, John R Ashton31Centre for Public Health, Faculty of Health and Applied Social Science, Liverpool John Moores University, Liverpool, UK2Behavioural Epidemiology, Centre for Public Health, Liverpool John Moores University3Government Office North West, Manchester, UKCorrespondence to: Professor M A Bellis Centre for Public Health, Faculty of Health and A
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