Expression of connexin 43 in dilated cardiomyopathy and its correlation with left ventricular ejection fraction　YUAN Yonghua¹, HE Xuehua¹, FANG Yibing¹, XIA Xiaohui² (1.Department of Pediatrics, 2.Deparment of Ultrasonography, Hunan People's Hospital, Changsha 410005, Hunan, China)