Prediction value of pulmonary hypertension in newly identified left ventricular dysfunction among adult patients after patent ductus arteriosus closure oleh Peng-yuan Chen, Dong-ling Luo, He-zhi Li, Hong-wen Fei, Tao Huang, Yi-gao Huang, Ji-mei Chen, Jian Zhuang, Peng-cheng He, Cao-jin Zhang