Study groups
BLIND
After the participants signed the consent form, we randomly assigned them into group I (Chinese idioms training) and group II (routine rehabilitation training) in a 1:1 manner. We used the random envelope method for grouping concealment. After preparing the randomization plan, the sequentially-coded, opaque, and sealed envelope was used. Each grouping plan was put into an opaque envelope, the code was written outside of it, and the envelope was sealed and given to the researcher. After each participant entered the study, the researcher will determine the eligibility of the subject, subsequently open the envelope with the corresponding number, and intervene accordingly. As this study involved changes in the content and form of rehabilitation training, it was impossible to blind participants and research intervention personnel, yet blinding will be used on data collection and analysis personnel to avoid bias to a great extent.