1 Joint Program in Nuclear Medicine, Department of Radiology, Brigham and Women's' Hospital, Harvard Medical School, Boston, Massachusetts, USA.
2 Department of Imaging, Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts, USA.
3 Department of Radiology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
4 Current affiliation: Division of Nuclear Medicine and Molecular Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA.
5 Brandeis University, Waltham, Massachusetts, USA.
6 Division of Gastroenterology, Department of Medicine, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
7 Colorectal Program, Center for Motility and Functional Gastrointestinal Disorders, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts, USA.