1. Department of Internal Medicine and Clinical NutritionInstitute of MedicineSahlgrenska AcademyUniversity of GothenburgGothenburgSweden
2. Department Center for Functional GI and Motility DisordersUniversity of North CarolinaChapel HillUSA
3. Department Faculty of Health SciencesBen-Gurion University of the NegevBe'er ShevaIsrael