[1] Univ New Mexico, Phys Therapy Program, Dept Orthopaed & Rehabil, Sch Med, Albuquerque, NM 87131 USA
[2] Univ Milan, Div Cardiol, Milan, Italy
[3] VA Palo Alto Healthcare Syst, Div Cardiol, Palo Alto, CA USA
[4] Lebauer Cardiovasc Res Fdn, Greensboro, NC USA
[5] Univ Miami, Dept Phys Therapy, Miami, FL USA
[6] Virginia Commonwealth Univ, Dept Internal Med, Richmond, VA USA
[7] Stanford Univ, Palo Alto, CA 94304 USA
[8] Brigham & Womens Hosp, Div Cardiovasc Med, Boston, MA 02115 USA