[1
]
Department of Surgery, University of Texas Southwestern Medical Center, Dallas2Department
of Surgery, North Texas Veterans Administration Healthcare System, Dallas.
[2
]
Department of Surgery, University of Texas Southwestern Medical Center, Dallas.
[3
]
University of Texas Southwestern Medical Center Library, Dallas.
[4
]
Departments of Epidemiology and Biostatistics, University of Pittsburgh, Pittsburgh,
Pennsylvania.
[5
]
Department of Surgery, University of Texas Southwestern Medical Center, Dallas2Department
of Surgery, North Texas Veterans Administration Healthcare System, Dallas5Department
of Biomedical Engineering, University of Texas-Arlington, Arlington6Deputy Edito.