1. Oklahoma Center for Neuroscience; University of Oklahoma Health Sciences Center; Oklahoma City OK USA
2. CURE Digestive Diseases Research Center; Division of Digestive Diseases and Departments of Medicine and Neurobiology; David Geffen School of Medicine; University of California Los Angeles; Los Angeles CA USA
3. Department of Medical and Surgical Sciences; University of Bologna; Bologna Italy
4. Department of Physiology; Veterans Affairs Medical Center; University of Oklahoma Health Sciences Center; Oklahoma City OK USA