Virtual reality-based therapy improves fatigue, impact, and quality of life in patients with multiple sclerosis. A systematic review with a meta-analysis - Cortés-Pérez I.; Sánchez-Alcalá M.; Nieto-Escámez F.A.; Castellote-Caballero Y.; Obrero-Gaitán E.; Osuna-Pérez M.C. (SENSORS, 2021)