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. 2018 Nov 1;19:600. doi: 10.1186/s13063-018-2930-y

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© The Author(s). 2018

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Consort diagram of the study course. 6MWT, 6-minute walk test; AV, atrioventricular; CRT, cardiac resynchronization therapy; CT, computed tomography; LV, left ventricular; LVEF, left ventricular ejection fraction; MLHFQ, Minnesota Living with Heart Failure Questionnaire; MP, myocardial perfusion; NYHA, New York Heart Association; QoL, quality of life; VVd, interventricular pacing delay