[1
]
Group Health Research Institute, Seattle, Washington2Division of General Internal
Medicine, Department of Medicine, University of Washington, Seattle.
[2
]
Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical
Center, Durham, North Carolina4Department of Biostatistics and Bioinformatics, Duke
University, Durham, North Carolina.
[3
]
Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical
Center, Durham, North Carolina.
[4
]
Veterans Administration North Texas Health Care System, Dallas6Division of Gastrointestinal
and Endocrine Surgery, University of Texas Southwestern Medical Center, Dallas7Division
of General Surgery, Northwestern University, Chicago, Illinois8Deputy Edito.
[5
]
Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical
Center, Durham, North Carolina9Division of General Internal Medicine, Department of
Medicine, Duke University, Durham, North Carolina.
[6
]
Pittsburgh Veterans Affairs Medical Center, Pittsburgh, Pennsylvania11Division of
Minimally Invasive Surgery, Department of Surgery, Allegheny Health Network, Temple
University, Philadelphia, Pennsylvania.