User Engagement Clusters of an 8-Week Digital Mental Health Intervention Guided by a Relational Agent (Woebot): Exploratory Study. - Hoffman, Valerie; Flom, Megan; Mariano, Timothy Y; Chiauzzi, Emil; Williams, Andre; Kirvin-Quamme, Andrew; Pajarito, Sarah; Durden, Emily; Perski, Olga (Journal of Medical Internet Research, 2023)