[1] COMIS FED ELECT,MED SERV,MEXICO CITY,MEXICO
[2] CORNELL UNIV,NEW YORK HOSP,MED CTR,DEPT MED,DIV CARDIOL,NEW YORK,NY 10021
[3] CORNELL UNIV,NEW YORK HOSP,MED CTR,MYOCARDIAL METAB LAB,NEW YORK,NY 10021
[4] INST NACL CARDIOL,DEPT EPIDEMIOL & PREVENT,MEXICO CITY,MEXICO