. 2020 Apr 15;4(4):e14747. doi: 10.2196/14747
©Marie-Luise Zeisler, Leman Bilgic, Maria Schumann, Annelene Wengler, Johannes Lemcke, Antje Gößwald, Thomas Lampert, Claudia Santos-Hövener, Patrick Schmich. Originally published in JMIR Formative Research (http://formative.jmir.org), 15.04.2020.
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Figure 1.
Sample design.