[This corrects the article DOI: 10.2196/24776.].
©Khanh Ngoc Cong Duong, Tien Nguyen Le Bao, Phuong Thi Lan Nguyen, Thanh Vo Van, Toi Phung Lam, Anh Pham Gia, Luerat Anuratpanich, Bay Vo Van. Originally published in JMIR Formative Research (http://formative.jmir.org), 05.03.2021.