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99 CHAPTER 6 THE RELATIONSHIP BETWEEN SELF-REPORTED FATIGUE IN CHILDREN WITH INFLAMMATORY BOWEL DISEASE AND HAEMOGLOBIN LEVELS AND DISEASE ACTIVITY: A MULTICENTRE CROSS-SECTIONAL STUDY Els Van de Vijver Nanja Bevers Saskia Vande Velde Henkjan J. Verkade Ella Roelant Patrick F van Rheenen