[1] BOSTON UNIV,SCH MED,PREVENT MED & EPIDEMIOL,BOSTON,MA 02118
[2] N AMER REASSURANCE CO,NEW YORK,NY 10017
[3] VET ADM MED CTR,CARDIOL SECT 111B,DENVER,CO 80220
[4] UNIV WASHINGTON HOSP,DEPT MED,DIV CARDIOL,SEATTLE,WA 98195
[5] ST LOUIS UNIV,MED CTR,EXERCISE & NUCL CARDIOL LAB,ST LOUIS,MO 63104
[6] NEW ENGLAND MED CTR,MED,BOSTON,MA 02111