Franks, P., Jerant, A.F., Leigh, J.P. et al. 2007
Gruber, J., Köszegi, B. 2004
Farrelly, M.C., Bray, J.W., Pechacek, T. et al. 2001
Centers for Disease Control and Prevention 1997
Chaloupka, F.J. 1991
Sayginsoy, O., Yürekli, A.A., de Beyer, J. 2001
Mao, Z., Sung, H.Y., Hu, T.W. et al. 2006
