1Brockton/West Roxbury VA Medical Center, West Roxbury, Massachusetts, Harvard Medical School, Boston, Massachusetts, Brigham and Women's Hospital, Boston, Massachusetts
2University of Miami Department of Surgery, Miami, Florida, University of Miami School of Medicine, Miami, Florida, Miami VA Medical Center, Miami, Florida
3Brockton/West Roxbury VA Medical Center, West Roxbury, Massachusetts, Harvard Medical School, Boston, Massachusetts, Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center, Boston, Massachusetts
4Department of Surgery, Department of Veterans Affairs Headquarters, Washington DC
5Hines VA Center for Cooperative Studies in Health Services, Hines, Illinois
6West Los Angeles VA Medical Center, West Los Angeles, California, University of California Los Angeles, Los Angeles, California
7Department of Surgery, University of Texas Health Science Center, San Antonio, Texas
8Veterans Integrated Service Network 11, Ann Arbor, Michigan
9Department of Anesthesia, National Anesthesia Services, Iowa City, Iowa
10Veterans Integrated Service Network 17, Grand Prairie, Texas
11Pittsburgh VA Medical Center, Pittsburgh, Pennsylvania, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
12Tampa VA Medical Center, Tampa, Florida, University of South Florida College of Medicine, Tampa, Florida
13Denver VA Medical Center, Denver, Colorado, University of Colorado Health Sciences Center, Denver, Colorado