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European Journal of Epidemiology > 1998 > 14 > 2 > 159-164
Calcified Tissue International > 1996 > 59 > 2 > 79-83
European Journal of Epidemiology > 1998 > 14 > 2 > 159-164
Calcified Tissue International > 1996 > 59 > 2 > 79-83