Predicting and Monitoring Symptoms in Patients Diagnosed With Depression Using Smartphone Data: Observational Study - Arsi Ikäheimonen; Nguyen Luong; Ilya Baryshnikov; Richard Darst; Roope Heikkilä; Joel Holmen; Annasofia Martikkala; Kirsi Riihimäki; Outi Saleva; Erkki Isometsä; Talayeh Aledavood (Journal of Medical Internet Research, 2024)