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RIFT Study Group on behalf of the West Midlands Research Collaborative.RIFT Study Group on behalf of the West Midlands Research Collaborative.Lancet Child Adolesc Health. 2020 Apr;4(4):271-280. doi: 10.1016/S2352-4642(20)30006-7. Epub 2020 Feb 13.Lancet Child Adolesc Health. 2020.PMID: 32200936