Correspondence to: Dr. CHEN Zhi-jian, Laboratory of Cardiovascular Immunology, Institute of Cardiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, China (Tel: 86-27-85726014. Fax: 86-27-85727140. Email: drchenok@sohu.com)