Klaassen, Tim http://orcid.org/0000-0002-1519-4026
Keszthelyi, Daniel http://orcid.org/0000-0001-9856-9980
Troost, Freddy J. http://orcid.org/0000-0002-0018-5557
Bast, Aalt http://orcid.org/0000-0002-5383-2789
Masclee, Adrian A. M. http://orcid.org/0000-0001-5819-0116
Article History
Received: 20 October 2020
Accepted: 8 January 2021
First Online: 8 February 2021
Compliance with ethical standards
:
: The researchers were involved in conducting two of the included studies: reference 26 (T.K., D.K., F.J.T., A.A.M.M.) and reference 34 (F.J.T., A.A.M.M.). For investigator-initiated study (reference 26), Will Pharma SA has received governmental funding (Subsidie MKB Innovatiestimulering Topsectoren, MIT) and covered all relevant costs related to the execution of that study. T.K. received a salary from Will Pharma SA as part of the ‘Subsidie MKB Innovatiestimulering Topsectoren’ (MIT) for the period related to the execution of that study (reference 26). D.K. and A.A.M.M. have received an unrestricted grant from Will Pharma SA for the execution of a study unrelated to the present study (peppermint oil in IBS). D.K. and A.A.M.M. have received grants from ZonMw, The Netherlands Organisation for Health Research and Development, to evaluate efficacy of peppermint oil in IBS, hypnotherapy in IBS, and the efficacy of nortriptyline in functional dyspepsia. D.K. and A.A.M.M. have received research funding from Allergan and Grünenthal on IBS topics. D.K. has received research funding from the Dutch Foundation for Gastroenterology (Maag-Lever-Darmstichting) for IBS and United Europe Gastroenterology (UEG) for fecal incontinence. A.A.M.M. has given scientific advice to Bayer (topic: IBS), to Kyowa Kirin (topic: constipation), and to Takeda (topic: gastroparesis). A.A.M.M. received funding from Pentax Europe GmbH. A.A.M.M. has received funding from the Dutch Cancer Society related to endoscopy and to colorectal polyps. A.B. reported no conflicts of interest.