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

SOBRAC
http://www.sobrac.org

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

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

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

Med Consult
http://home.mdconsult.com

Medlife
http://members.tripod.com/medlife_ua

MedLine
http://medline.cos.com

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

Medscape
http://www.medscape.com

PubMed Retrieval System
http://www.ncbi.nlm.nih.gov/PubMed

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

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

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

SCIELO
http://www.scielo.br

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