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Best Practice & Research Clinical Gastroenterology > 2001 > 15 > 2 > 249-265
Journal of Hospital Infection > 2000 > 46 > 3 > 194-202
Preventive Medicine > 1997 > 26 > 3 > 311-319
Best Practice & Research Clinical Gastroenterology > 2001 > 15 > 2 > 249-265
Journal of Hospital Infection > 2000 > 46 > 3 > 194-202
Preventive Medicine > 1997 > 26 > 3 > 311-319