1. Department of Cardiovascular Surgery, German Heart Center Munich at the Technical University, Munich, Germany
2. Department of Paediatric Cardiology and Congenital Heart Defects, German Heart Center Munich at the Technical University, Munich, Germany
3. Shanghai Xingzhuangjiyi Alloy Material Corporation, Shanghai, P. R. China
4. Cardiac Surgery Department, Affiliated Linyi People's Hospital at Shandong University, Linyi, Shandong, P. R. China