1. Department of Physical Therapy, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
2. Department of Gastrosurgical Research and Education, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
3. Department of Surgery, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
4. Department of Otorhinolaryngology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden