Changes in Ventricular Rate during the 6-minute Walk Test in Patients with Atrial Fibrillation Treated with Bisoprolol versus Metoprolol 
LUO Xiao,HUANG Qingxia,XU Jinsong,YU Yun,XIE Feng,ZHOU Wei,LIU Yue,SUN Xiaopei
Chinese General Practice . 2018, (34): 4237 -4240 .  DOI: 10.12114/j.issn.1007-9572.2018.34.015