. 2013 Jan 16;2(1):e3. doi: 10.2196/resprot.2246
©Viola Voncken-Brewster, Albine Moser, Trudy van der Weijden, Zsolt Nagykaldi, Hein de Vries, Huibert Tange. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 16.01.2013.
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Figure 1.
Screenshot of a recording.