We thank Dietze and colleagues for their letter and offer the following responses.
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Degenhardt is supported by a National Health and Medical Research Council Principal Research Fellowship (no. 1041472). The National Drug and Alcohol Research Centre at the University of New South Wales and the National Drug Research Institute at Curtin University are supported by funding from the Australian Government under the Substance Misuse Prevention and Service Improvements Grant Fund. The Centre for Youth Substance Abuse Research at the University of Queensland receives core funding from the Graeme Wood Foundation.