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Journal of Medical Virology > 94 > 7 > 3087 - 3095
Best Practice & Research Clinical Gastroenterology > 2011 > 25 > 1 > 3-18
Journal of Urban Health > 2006 > 83 > 3 > 421-433
Journal of Clinical Epidemiology > 1995 > 48 > 10 > 1277-1283