Longitudinal Digital Phenotyping of Multiple Sclerosis Severity Using Passively Sensed Behaviors and Ecological Momentary Assessments: Real-World Evaluation. - Xia, Zongqi; Chikersal, Prerna; Venkatesh, Shruthi; Walker, Elizabeth; Dey, Anind K; Goel, Mayank (Journal of Medical Internet Research, 2025)