1. Clinica Olivos, Buenos Aires, Republica Argentina
2. Instituto Cardiovascular de Buenos Aires, Republica Argentina
3. Sanatorio Anchorena, Buenos Aires, Republica Argentina
4. Glaxo Wellcome, Inc., Research Triangle Park, NC
5. Glaxo Wellcome, PLU, UK
6. Lynx Therapeutics, Inc., Hayward, CA
7. Thomas Jefferson University, Philadelphia, PA