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Petkova, R., Ileva, R., Rusenov, A. 2003
Nassar, H., Metwally, M.M. 2003
Devlin, E., Eadie, D., Angus, K. et al. 2002
Alamar, B.C., Mahmoud, L., Glantz, S.A. 2002
Centers for Disease Control and Prevention 2001