Happiness or hopelessness in late life: A cluster RCT of the 3L-Mind-Training programme among the institutionalized older people.

Data were obtained from the project, initiated in 2014, which was funded by the Ministry of Science and Technology in Taiwan and was approved by the Institutional Review Board in Chung Shan Medical University (No. CS15009). The trial registration number of the study was No. ChiCTR1900021811.