Submitted on: 02 March 2013.
Revised on: 02 June 2013.
Accepted on: 07 July 2013.
___________________BMC Cardiovascular Disorders---BMC
http://reply.papertrans.cn/1/39/3871/3871-32.png
Submitted on: 04 December 2002.
Revised on: 05 March 2003.
Accepted on: 14 April 2003.
___________________BMC Cardiovascular Disorders---BMC
http://reply.papertrans.cn/1/39/3871/3871-34.png
http://reply.papertrans.cn/1/39/3871/3871-35.png
http://reply.papertrans.cn/1/39/3871/3871-36.png