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| **[National Digestive Diseases Information Clearinghouse (NDDIC),|http://digestive.niddk.nih.gov/about/contact.htm] Bethesda MD |
| **National Institute for Health and Clinical Excellence, [NICE|http://www.nice.org.uk] |
| **[National Digestive Diseases Information Clearinghouse (NDDIC)|http://digestive.niddk.nih.gov/about/contact.htm], Bethesda MD |
| **[National Institute for Health and Clinical Excellence, (NICE)|http://www.nice.org.uk], |