Shanghai, China

Author Affiliations: Heart Center, Shanghai Children's Medical Center, Medical School, Shanghai Jiaotong University, Shanghai 200127, China (Su ZK, Chen E)

Corresponding Author: Zhao-Kang Su, MD, Heart Center, Shanghai Children's Medical Center, Medical School, Shanghai Jiaotong University, Shanghai 210027, China (Tel: 86-21-38626161 ext 6888; Email: chien.1944@yahoo.com.cn)