1. Division of Gastroenterology; Department of Internal Medicine; Maastricht University Medical Center; Maastricht the Netherlands
2. Centre for Neuroscience and Trauma; Blizard Institute; Wingate Institute of Neurogastroenterology; Barts and the London School of Medicine and Dentistry; Queen Mary University of London; UK
3. Department of Neuroimaging; Institute of Psychiatry, Psychology & Neuroscience at King's College London; UK
4. Pain Management Research Institute; The University of Sydney at Royal North Shore Hospital; St Leonards NSW Australia
5. Department of Neurology; Philipps-University Marburg; Marburg Germany