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. 2018 Jan 30;8(1):e017781. doi: 10.1136/bmjopen-2017-017781

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Stepped-wedge design with nine clusters. At baseline, all clusters provide usual care. At 2-month intervals, the clusters cross over to the intervention. How long the care programme is implemented in a cluster at 20 months varies from 2 months (cluster 9) to 18 months (cluster 1).