Correction: Strategies for the Successful Implementation of a Novel iPhone Loaner System (iShare) in mHealth Interventions: Prospective Study - William E Yang; Erin M Spaulding; David Lumelsky; George Hung; Pauline Phuong Huynh; Kellen Knowles; Francoise A Marvel; Valerie Vilarino; Jane Wang; Lochan M Shah; Helen Xun; Rongzi Shan; et al. (JMIR mHealth and uHealth, 2021)