- Correspondence to:
Dr R W Summers
James A Clifton Center for Digestive Diseases, Department of Internal Medicine, University of Iowa Roy J and Lucille A Carver College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242, USA;
- Accepted April 9, 2004
- Revised March 28, 2004
- First published December 10, 2004.
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