Corrigendum to "There's No App for That: Assessing the Impact of mHealth on the Supervision, Motivation, Engagement, and Satisfaction of Community Health Workers in Sierra Leone" [Annals of Global Health 82 (2016) 936-949] - Frédérique Vallières; Eilish McAuliffe; Bianca van Bavel; PJ Wall; Augustine Trye (Ubiquity Press, 2017)