1 Department of Neurology, University Hospital Münster, Münster, Germany. dziewas@uni-muenster.de.
2 Department of Otorhinolaryngology, Head and Neck Surgery, Maastricht University Medical Center, Maastricht, The Netherlands.
3 GROW-School for Oncology and Developmental Biology, Maastricht University Medical Center, Maastricht, The Netherlands.
4 Phoniatric Unit, Sacco Hospital Milano, Department of Biomedical and Clinical Sciences, University of Milano, Milan, Italy.
5 Physical and Rehabilitation Medicine, Physiology Department, Rouen University Hospital, Rouen, France.
6 GI Sciences, Division of Diabetes, Endocrinology and Gastroenterology, School of Medical Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, Great Britain.
7 Centro de Investigación Biomédica en Red de Enfermedades, Hepáticas y Digestivas (CIBERehd), Hospital de Mataró, Universitat Autònoma de Barcelona, Mataró, Spain.