Engagement in Digital Health Interventions: Open Questions for Research and Design. - Saskia M. Kelders; Iris ten Klooster; Sofia Bastoni; Isabella Cadoni; Kerem Dogan; Hanneke Kip; Nienke Beerlage-de Jong; Rúben Gouveia 001; Stephen M. Schueller; Bruna Oewel; Kevin Doherty; Guendalina Graffigna; et al. (CHI Extended Abstracts, 2026)