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Kyle, S. D., Madigan, C., Begum, N., Abel, L., Armstrong, S., Aveyard, P., Bower, P., Ogburn, E., Siriwardena, A., Yu, L., & Espie, C. A. (2020). primary care treatment of insomnia: study protocol for a pragmatic, multicentre, randomised controlled trial comparing nurse-delivered sleep restriction therapy to sleep hygiene (the HABIT trial). BMJ open, 10(3), . http://access.bl.uk/ark:/81055/vdc_100131046851.0x000033