The impact of video gaming on cognitive functioning of people with schizophrenia (GAME-S): study protocol of a randomised controlled trial oleh Maritta Välimäki, Min Yang, Yuen Ting Joyce Lam, Tella Lantta, Matias Palva, Satu Palva, Benjamin Yee, Siu Hung Yip, Kin-sun Dan Yu, Hing Chiu Charles Chang, Po Yee Ivy Cheng, Daniel Bressington