BMJ Open.2018 Jan8;8(1):e019014. doi: 10.1136/bmjopen-2017-019014
BMJ . 2017 Aug 16;358:j3448. doi: 10.1136/bmj.j3448.
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BMJ Open.2018 Jan8;8(1):e019014. doi: 10.1136/bmjopen-2017-019014
BMJ . 2017 Aug 16;358:j3448. doi: 10.1136/bmj.j3448.