1. Department of Gastroenterology, University Hospital Coventry and Warwickshire, Coventry CV2 2DX, UK
2. Department of Gastroenterology and Hepatology, Amsterdam Gastroenterology Endocrinology Metabolism, Amsterdam University Medical Centre, Vrije Universiteit Amsterdam, 1081 Amsterdam, The Netherlands
3. Department of Pediatric Gastroenterology, Emma’s Children Hospital, Amsterdam UMC, 1105 Amsterdam, The Netherlands
4. Institute of Clinical and Preventative Medicine, University of Latvia, LV-1586 Riga, Latvia
5. Department of Surgery and Cancer, Imperial College London, London SW7 2AZ, UK
6. Department of Chemistry, University of Bari Aldo Moro, 70121 Bari, Italy
7. Department of Surgery, University of Bari Aldo Moro, 70121 Bari, Italy