[This corrects the article DOI: 10.2196/13201.].
©Zhi-Wei Zheng, Qing-Ling Yang, Zhong-Qi Liu, Jia-Ling Qiu, Jing Gu, Yuan-Tao Hao, Chao Song, Zhong-Wei Jia, Chun Hao. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 03.03.2020.