. 2020 Mar 17;22(3):e15790. doi: 10.2196/15790
©Kerstin Frie, Jamie Hartmann-Boyce, Susan Jebb, Jason Oke, Paul Aveyard. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 17.03.2020.
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Figure 1.
Case-crossover study design to establish linear mixed effects models for research question 1.