American Association for Thoracic Surgery
http://www.aats.org/

American Heart Association
http://www.americanheart.org/

Arquivos Brasileiros de Cardiologia
http://www.arquivosonline.com.br/

BIREME
http://www.bireme.br/

Community of Science Web Server
http://www.cos.com/

DECA
http://www.deca.org.br/

European Society of Cardiology
http://www.escardio.org/

Heart Rhythm Society
http://www.hrsonline.org/

Knowledge Finder.
http://www.kfinder.com/

Medline Database at Community of Science, Inc.
http://medline.cos.com/

Medscape
http://www.medscape.com/

SBCCV
http://www.sbccv.org.br/

SICCVESP
http://www.scicvesp.org.br/

SOCESP
http://www.socesp.org.br/

The American Board of Thoracic Surgery
http://www.abts.org/