1. Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, USA
2. Veterans Affairs Connecticut Healthcare System, West Haven, Connecticut, USA
3. Boston University School of Medicine, Boston, Massachusetts, USA
4. Department of Pathology and Laboratory Medicine, University of Vermont, Burlington, Vermont, USA
5. Department of Internal Medicine, Yale School of Medicine, West Haven, Connecticut, USA
6. Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, USA
7. Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois, USA