University of California, Los Angeles (UCLA) - Department of Surgery, University of California, Los Angeles (UCLA) - Cardiovascular Outcomes Research Laboratories (CORELAB), University of California, Los Angeles (UCLA) - Cardiovascular Outcomes Research Laboratories (CORELAB), University of California, Los Angeles (UCLA) - Harbor-UCLA Medical Center, University of California, Los Angeles (UCLA) - Harbor-UCLA Medical Center, University of California, Los Angeles (UCLA) - Harbor-UCLA Medical Center and University of California, Los Angeles (UCLA) - Cardiovascular Outcomes Research Laboratories (CORELAB)