Expected Competencies and Personal Attributes of Digital Health Navigators to Support Digital Mental Health Care: Focus Group and Interview Study With Patients and Health Care Professionals. - Freisberg L; Meier-Diedrich E; Heinze M; Schönbeck J; Schubert D; Speck J; Strudwick G; Torous J; Schwarz J (JMIR mental health, 2026)