Digital health monitoring for adults with treatment-resistant depression: Observational feasibility study protocol - Karisa Parkington; Reinhard Janssen Aguilar; Gyu Hee Lee; Alice Rueda; Fathima Adamsahib; Mohammad Al-Hassan; Stephanie Famuditimi; Perry Menzies; Qiaowei Lin; Wendy Lou; Sridhar Krishnan; Venkat Bhat (PLoS ONE, 2025)