Qingdao Women and Children’s Hospital Qingdao University Qingdao 266034 PR China;
Qingdao Women and Children’s Hospital Qingdao University Qingdao 266034 PR China;
Qingdao Women and Children’s Hospital Qingdao University Qingdao 266034 PR China;
Qingdao Women and Children’s Hospital Qingdao University Qingdao 266034 PR China;
Qingdao Women and Children’s Hospital Qingdao University Qingdao 266034 PR China;
Congenital heart disease; Fetal balloon atrial septoplasty; Hypoplastic left heart syndrome; Intact or highly restrictive atrial septum;