title: A 22-year-old woman with recurrent gastrointestinal bleeding since childhood.
authors.affiliation: St Mark's Hospital, Watford Road, Harrow HA1 3UJ, Tel: +44 208 235 4089, , e-mail: naila.arebi@imperial.ac.uk.
authors.forename: Naila
authors.initials: N
authors.lastname: Arebi
authors.forename: Chris
authors.initials: C
authors.lastname: Fraser