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This article has been accepted for publication in [Heart, 2019] following peer review, and the Version of Record can be accessed online at 
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Excepté là où spécifié autrement, la license de ce document est décrite en tant que BMJ Journals See here for full instructions. This article has been accepted for publication in [Heart, 2019] following peer review, and the Version of Record can be accessed online at [http://dx.doi.org/10.1136/heartjnl-2018-314486]. Reuse of this manuscript version (excluding any databases, tables, diagrams, photographs and other images or illustrative material included where another copyright owner is identified) is permitted strictly pursuant to the terms of the Creative Commons Attribution-Non-Commercial 4.0 International (CC-BY-NC 4.0).