1 Division of Gastroenterology, Duke University, Durham, North Carolina; Duke Clinical Research Institute, Durham, North Carolina.
2 Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina.
3 Duke University Hospital, Durham, North Carolina.
4 Medical Center Library and Archives, Duke University School of Medicine, Durham, North Carolina.
5 Department of Medicine, Wake Forest University School of Medicine, Winston-Salem, North Carolina; Department of Pediatrics, Wake Forest School of Medicine, Winston-Salem, North Carolina; Division of Public Health Sciences, Wake Forest School of Medicine, Winston-Salem, North Carolina.