1. Apex Heart Institute; Ahmedabad India
2. Department of Cardiology; Sheth V.S. General Hospital and Smt. N.H.L. Municipal Medical College; Ahmedabad 380 006 India
3. Department of Cardiology; Mercy Hospital and Community Medical Center; Scranton Pennsylvania
4. Duke University Medical Center; Durham North Carolina
5. Quebec Heart-Lung Institute; Quebec City Canada
6. NYU School of Medicine; New York