Gastrointestinal Research Unit, Leicester General Hospital, Leicester, England, United Kingdom Reprint requests and correspondence: Jayne A Eaden, MBChB, MRCP, The Gastrointestinal Research Unit, Leicester General Hospital, Gwendolen Road, Leicester, England LE5 4PW. Received 22 September 1999; accepted 25 April 2000
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Eaden et al. (2000) studied this question.