13 Department of Neurosurgery and Spine, Northwest Permanente/Kaiser Foundation of Northwest, Clackamas, Oregon, USA.
14 Department of General Surgery, North-Western State Medical University, Saint Petersburg, Russia.
15 Hepato-Pancreato-Biliary Unit, Manchester Royal Infirmary, Manchester, UK.
16 Division of Surgery and Oncology, Department of Clinical Science, Intervention and Technology, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden.
17 Department of Surgery, University Hospital Cassiano Antônio de Morais, Vitória Espírito Santo, Brazil.