1. Department of SurgeryMedical University of Vienna Vienna Austria
2. Reflux Medical Vienna Austria
3. University Hospital for Digestive Surgery, Clinical Center of SerbiaUniversity of Belgrade Belgrade Serbia
4. Division of General Surgery, Department of Biomedical Sciences for Health, University of Milano School of MedicineIRCCS Policlinico San Donato Milano Italy
5. Department of Surgery, Universidade Federal do Rio Grande do SulHospital de Clinicas de Porto Alegre Porto Alegre Brazil
6. Division of Gastroenterology and HepatologyMedical University of South Carolina Charleston South Carolina