AUTHOR CONTRIBUTIONS
Marieke Verkleij: Conceptualization; investigation; formal analysis;
visualization; data curation; project administration; funding
acquisition; methodology; resources; supervision; writing—original
draft; writing—review and editing.
Berber Vlieg-Boerstra: Conceptualization, supervision, reviewing,
dietary analysis.
Geesje H Hofsteenge: Conceptualization; inclusion patients, data
collection and review.
Eric Haarman: Inclusion patient, manuscript revision.
Jos Twisk: Statistical analyses and review.
Alexandra L Quittner: Developed the GI Symptom Tracker and the CFQ-R;
conceptualization, reviewing data, manuscript revisions.
Tim de Meij: Conceptualization, funding acquisition, reviewing,
supervision.