. 2019 Jan 30;8(1):e11596. doi: 10.2196/11596
©Luis MT Jesus, Joaquim Santos, Joana Martinez. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 30.01.2019.
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Figure 3.
The “smileyometers”: Left (question 1 and question 2); right (question 3).