Correspondence to: Dr. LI Ling-ke, Department of Cardiovascular Surgery, Air Force General Hospital, Beijing 100142, China (Email: llk6999@126.com); Dr. ZHANG Yan-bo, Department of Pediatric Heart Center, State Key Laboratory of Cardiovascular Disease, Fuwai Hospital, National Center for Cardiovascular Disease, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China (cardiacsurgeon@yeah.net) Dr. ZHU Yao-bin, Department of Pediatric Heart Center, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China (Email: zhuyaobin@yeah.net);