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Guindon, G.E., Perucic, A.M., Boisclair, D. 2003
Chaloupka, F.J., Warner, K.E. 2000
Blough, D.K., Madden, C.W., Hornbrook, M.C. 1999
Gallus, S., Tramacere, I., Boffetta, P. et al. 2011