[1] Clin Res Pharm Coordinat Ctr, VA Cooperat Studies Program, Albuquerque, NM 87106 USA
[2] NHLBI, Bethesda, MD 20892 USA
[3] Eli Lilly & Co, Indianapolis, IN 46285 USA
[4] McMaster Clin, Hamilton, ON, Canada
[5] VA Med Ctr, Cooperat Studies Program Coordinating Ctr, Perry Point, MD USA
[6] Univ Maryland, Dept Epidemiol & Prevent Med, Baltimore, MD 21201 USA