Qing-Xin-Jie-Yu Granules in addition to conventional treatment for patients with stable coronary artery disease (QUEST Trial): study protocol for a randomized controlled trial. - Shengyao Li; Ming Guo; Huimin Mao; Zhuye Gao; Hao Xu; Dazhuo Shi; Li, Shengyao; Guo, Ming; Mao, Huimin; Gao, Zhuye; Xu, Hao; Shi, Dazhuo (Trials, 2016)