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. 2021 Jan 11;8:536370. doi: 10.3389/fpubh.2020.536370

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Copyright © 2021 Wang, Scheider, Sporrel, Deutekom, Timmer and Kröse.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Temporal patterns of 25 random users in each cluster, where the y-axis represents the user and the x-axis represents the week of a year. The blue scale implies the running frequency of a user in a week.