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. 2019 May 21;21(5):e12412. doi: 10.2196/12412

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©Niels Henrik Ingvar Hjollund, José Maria Valderas, Derek Kyte, Melanie Jane Calvert. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 21.05.2019.

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 the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Joint use of health data based on data collected during patient follow-up. The oblique arrow indicates identification of missing patients, observations, and variables for alternative use.