[1] Goethe university,Department of Surgery
[2] University of Turin,SCDU General Surgery 1
[3] Company City Hospital and Healht Science of Turin,General Hospital, Strumica
[4] University Surgical Clinic St. Naum Ohridski,Department of Surgery
[5] Public Health Organization,Upper Digestive Surgery
[6] Public Hospital,Department of Surgery
[7] University of Kentucky,Department of Surgery
[8] University of Verona,Department of Neuroscience
[9] Erasmus University Medical Center,Department of General, Visceral and Oncologic Surgery
[10] Academic Medical Center,Cluster of Tissue engeneering
[11] Erasmus University Medical Center,Departamento de Cirugia
[12] Klinikum Bogenhausen,Clinical center of Serbia
[13] Marienhospital Gelsenkirchen,Medical School
[14] Texas endosurgery Institute,Gil Medical Center
[15] Wilhelminenspital,Department of Abdominal
[16] Ludwig Boltzmann Institute of Traumatology,, Vascular and Transplant Surgery
[17] Brazilian lutern hospital,Department of General Surgery
[18] Instituto de Investigaciones Medicas A. Lanari,undefined
[19] University Clinic for Digestive Surgery,undefined
[20] University of Belgrade,undefined
[21] Ospedale Civile San Salvatore,undefined
[22] Gachon University,undefined
[23] Cologne-Merheim Medical Center University of Witten/Herdecke,undefined
[24] Ankara University School of Medicine,undefined