Sahaj Samadhi meditation vs a Health Enhancement Program in improving late-life depression severity and executive function: study protocol for a two-site, randomized controlled trial

萨哈吉·萨玛迪冥想与健康促进计划在改善老年抑郁症严重程度和执行功能方面的比较：一项双中心随机对照试验的研究方案