From the Department of Cardiology, Tianjin First Central Hospital, Tianjin Medical University, Tianjin, China.
The authors report no conflicts of interest regarding the content herein.
Manuscript submitted June 30, 2008, provisional acceptance given August 8, 2008, manuscript accepted August 29, 2008.
Address for correspondence: Xiaofei Wang, MD, Department of Cardiology, Tianjin First Central Hospital, 24 Fukang Road, Nankai District, Tianjin, 300192, China. E-mail: email@example.com