[1
]
Department of Surgery, Meander Medical Center, Amersfoort, the Netherlands.
[2
]
Department of Surgery, University Medical Center Groningen, Groningen, the Netherlands.
[3
]
Department of Surgery, Amphia Hospital, Breda, the Netherlands.
[4
]
Department of Surgery, St. Antonius Hospital, Nieuwegein, the Netherlands.
[5
]
Department of Surgery, Tergooi Hospital, Hilversum, the Netherlands.
[6
]
Department of Surgery, Laurentius Hospital, Roermond, the Netherlands.
[7
]
Department of Surgery, Diakonessenhuis, Utrecht, the Netherlands.
[8
]
Department of Surgery, Jeroen Bosch Hospital, Den Bosch, the Netherlands.