European Journal of Epidemiology
European Journal of Epidemiology > 1997 > 13 > 5 > 573-580
European Journal of Epidemiology > 1997 > 13 > 8 > 959-962
European Journal of Epidemiology > 1998 > 14 > 5 > 511-517
European Journal of Epidemiology > 1999 > 15 > 7 > 665-669