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European Journal of Internal Medicine > 2008 > 19 > 6 > 452-460
American Journal of Preventive Medicine > 1998 > 15 > 3 > 246-249
European Journal of Internal Medicine > 2008 > 19 > 6 > 452-460
American Journal of Preventive Medicine > 1998 > 15 > 3 > 246-249