[1
]
Department of Internal and Integrative Medicine, Kliniken Essen-Mitte, Faculty of
Medicine, University of Duisburg-Essen, Essen, Germany.
[2
]
Tempelhof Colon Centre, St. Joseph's Hospital, Berlin, Germany.
[3
]
Department of Surgery and Centre for Minimal Invasive Surgery, Kliniken Essen-Mitte,
University of Duisburg-Essen, Essen, Germany.
[4
]
Department of Pain Management, Krankenhaus St. Josef, Wuppertal, Germany.
[5
]
Department of Community Health, National University, San Diego, CA, USA.
[6
]
Department of Internal and Complementary Medicine, Immanuel Hospital Berlin, Berlin,
Germany.
[7
]
Institute of Social Medicine, Epidemiology and Health Economics, Charité University
Medical Centre, Berlin, Germany.
[8
]
Department of Integrative Gastroenterology, Kliniken Essen-Mitte, Faculty of Medicine,
University of Duisburg-Essen, Essen, Germany.