. 2020 Jul 27;8(7):e17652. doi: 10.2196/17652
©Xiaoyi Pan, Boyu Chen, Heng Weng, Yongyi Gong, Yingying Qu. Originally published in JMIR Medical Informatics (http://medinform.jmir.org), 27.07.2020.
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Figure 3.
Reference time identification.