1. European Commission, Joint Research Centre (JRC) , Geel , Belgium
2. NHS Bowel Cancer Screening Programme, South of England Hub , Guildford , UK
3. Department of Clinical Chemistry , Queen Beatrix Hospital , Winterswijk , The Netherlands
4. Dutch Foundation for Quality Assessment in Medical Laboratories (SKML) , Nijmegen , The Netherlands
5. Department of Clinical Chemistry , Reinier Haga Medical Diagnostic Center , Delft , The Netherlands
6. Clinical Biochemistry, Royal Surrey Foundation Trust, Berkshire and Surrey Pathology Services , Guildford , UK