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Michael Fendrich, Mary Ellen Mackesy-Amiti, Timothy P. Johnson
Ann Epidemiol.
Published in final edited form as: Ann Epidemiol. 2008 Oct; 18(10): 752–759. Published online 2008 Aug 9. doi: 10.1016/j.annepidem.2008.06.001
PMCID:
PMC2586999

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