[This corrects the article DOI: 10.2196/12223.].
©Sang Hyun Ahn, Jooho Zhiang, Hyery Kim, Seyun Chang, Jaewon Shin, Myeongchan Kim, Yura Lee, Jae-Ho Lee, Yu Rang Park. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 07.05.2020.