Corrigendum: Brain training with non-action video games enhances aspects of cognition in older adults: a randomized controlled trial - Ballesteros, Soledad; Prieto, Antonio; Mayas, Julia; Toril, Pilar; Pita, Carmen; Ponce de León, Laura; Reales, José M.; Waterworth, John (Frontiers in Aging Neuroscience, 2015)