[1
]
Clinic of General and Visceral Surgery, University of Ulm, Ulm, Germany.
[2
]
Institute of Epidemiology and Medical Biometry, University of Ulm, Ulm, Germany.
[3
]
Clinic of General and Visceral Surgery, University of Ulm, Ulm, Germany marko.kornmann@uniklinik-ulm.de.