aDept. of Psychology and Behavioural Sciences, Aarhus University, Aarhus, Denmark,

bCenter for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Aalborg, Denmark

cDepartment of Medical Gastroenterology, Mech-Sense, Aalborg University Hospital, Aalborg, Denmark

dDepartment of Oncology, Aarhus University Hospital, Aarhus, Denmark

*Corresponding author. Address: Bartholin's Allé 9, DK8000 Aarhus, Denmark. Tel.: +45 61772533. E-mail address: [email protected] (M. B. Mikkelsen).

Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.

PROSPERO registration: CRD42021273242.

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