Elsevier, Gastrointestinal Endoscopy, 5(59), p. P201
DOI: 10.1016/s0016-5107(04)00928-9
Elsevier, Gastrointestinal Endoscopy, 4(60), p. 640-644
DOI: 10.1016/s0016-5107(04)01959-5
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