^aResearch Institute, Colombian Cardiovascular Foundation, Colombia

^bResearch Direction, Medical School, Santander University (UDES), Bucaramanga, Colombia

Received 6 April, 2008

Accepted 14 May, 2008

Correspondence to Patricio Lopez-Jaramillo, MD, PhD, Fundación Cardiovascular de Colombia, Calle 155A N. 23-58, Urb. El Bosque, Floridablanca, Santander, Colombia Tel: +57 7 6399292x331; e-mail: [email protected]/[email protected]