[This corrects the article DOI: 10.2196/13668.].
©Peter Washington, Haik Kalantarian, Qandeel Tariq, Jessey Schwartz, Kaitlyn Dunlap, Brianna Chrisman, Maya Varma, Michael Ning, Aaron Kline, Nathaniel Stockham, Kelley Paskov, Catalin Voss, Nick Haber, Dennis Paul Wall. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 27.06.2019.