Affiliations of authors:
1. Department of Internal Medicine, Allegheny General Hospital,
Allegheny Health Network, Pittsburgh, U.S.A. Fax: none
2. Department of Cardiovascular Medicine, Allegheny General Hospital,
Allegheny Health Network, Pittsburgh, U.S.A. Fax: none
3. Department of Sports Medicine, Allegheny General Hospital, Allegheny
Health Network, Pittsburgh, U.S.A. Fax: none