Normal Values of Echocardiographic Left Atrioventricular Coupling Index and Left Atrial Stiffness Index Reflecting Left Ventricular Diastolic Function: A Multicenter Study

Tian-Xin Dong, Shiwen Li, Xiaofang Pan, Chunfeng Wang, Ying Liu, Jun Wu, Xiang-Ping Guan, Suli Zhang, Pengfei Zuo, Yilin Liu, Liyan Wang, Lei Cui, Yan Liu, Yu-Qiong Lai, Mingyan Ding, Guilin Lu, Jing Tan, Xinjian Yang, Yi-Hong Li, Yong-Huai Wang, Xintong Zhang, Wei-Dong Ren, Chunyan Ma