About the Authors

Sjoukje-Marije Haisma

Roles Conceptualization, Formal analysis, Investigation, Methodology, Writing – original draft, Writing – review & editing

Affiliation Department of Paediatric Gastroenterology Hepatology and Nutrition, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands

Anne Galaurchi

Roles Conceptualization, Formal analysis, Investigation, Methodology, Writing – review & editing

Affiliation Department of Paediatric Gastroenterology Hepatology and Nutrition, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands

Shatha Almahwzi

Roles Conceptualization, Formal analysis, Investigation, Methodology, Writing – review & editing

Affiliation Department of Paediatric Gastroenterology Hepatology and Nutrition, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands

Joy A. Adekanmi Balogun

Roles Conceptualization, Formal analysis, Investigation, Methodology, Writing – review & editing

Affiliation Department of Paediatric Gastroenterology Hepatology and Nutrition, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands

Anneke C. Muller Kobold

Roles Conceptualization, Formal analysis, Investigation, Methodology, Writing – review & editing

Affiliation Department of Laboratory Medicine, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands

Patrick F. van Rheenen

Roles Conceptualization, Formal analysis, Investigation, Methodology, Supervision, Writing – original draft, Writing – review & editing

p.f.van.rheenen@umcg.nl

Affiliation Department of Paediatric Gastroenterology Hepatology and Nutrition, University of Groningen, University Medical Centre Groningen, Groningen, the Netherlands

Competing Interests

We have read the journal’s policy and the authors of this manuscript have the following competing interests: This work was supported by BÜHLMANN Laboratories AG, manufacturer of the IBDoc home test and the fCAL ELISA assay used in this study. Immundiagnostik AG, manufacturer of the QuantOn Cal home test and IDK-Calprotectin ELISA assay, kindly donated reagents and extraction devices for unrestricted use. Neither company had a role in the design of this study, nor in the execution, analyses, interpretation of the data or decision to submit results. This does not alter the authors’ adherence to PLOS ONE policies on sharing data and materials.