Effectiveness of a clinical decision support system for hypertension management in primary care: study protocol for a pragmatic cluster-randomized controlled trial oleh Jiali Song, Xiuling Wang, Bin Wang, Yan Gao, Jiamin Liu, Haibo Zhang, Xi Li, Jing Li, Ji-Guang Wang, Jun Cai, Jeph Herrin, Jane Armitage, Harlan M. Krumholz, Xin Zheng, on behalf of the LIGHT Collaborative Group