Gastrointestinal recall questionnaires compare poorly with prospective patient diaries for gastrointestinal symptoms: Data from population and primary health centre samples

- Jones, Michael P.; Walter, Susanna; Faresjö, Åshild; Grodzinsky, Ewa; Kjellström, Lars; Viktorsson, Lisa; Talley, Nicholas J.; Agreus, Lars; Andreasson, Anna