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. 2019 Jul 23;9(7):e025513. doi: 10.1136/bmjopen-2018-025513

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Flow diagram of the study procedure about here. GP, general practitioner; R&D, Research and Development; RCT, randomised controlled trial.