1. Center for Clinical Research and Health Promotion, University of Puerto Rico Medical Sciences Campus, San Juan, Puerto Rico;
2. Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA;
3. Department of Pathology and Center for Free Radical Biology, University of Alabama at Birmingham, Birmingham, AL, USA;
4. Cardiology Division, Department of Medicine, University of Puerto Rico Medical Sciences Campus, San Juan, Puerto Rico