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. 2019 Apr 15;8(4):e12144. doi: 10.2196/12144

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©Christian Mueller, Barbara Stollfuss, Alexander Roitenberg, Jonas Harder, Manuel J Richter. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 15.04.2019.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Research Protocols, is properly cited. The complete bibliographic information, a link to the original publication on http://www.researchprotocols.org, as well as this copyright and license information must be included.

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Study visits and data collection. 6MWD: 6-min walk distance; BNP: brain natriuretic peptide; NT-proBNP: N-terminal pro–brain natriuretic peptide; HRQoL: health-related quality of life; WHO FC: World Health Organization functional class.