Correction: A treadmill training program in a gamified virtual reality environment combined with transcranial direct current stimulation in Parkinson’s Disease: Study protocol for a randomized controlled trial - Pere Bosch-Barceló; Carolina Climent-Sanz; Oriol Martínez-Navarro; Maria Masbernat-Almenara; Anni Pakarinen; Pradip K. Ghosh; Helena Fernández-Lago (PLoS ONE, 2026)