Calcium, diet and fracture risk: a prospective study of 1898 incident fractures among 34 696 British women and men. - Key TJ; Appleby PN; Spencer EA; Roddam AW; Neale RE; Allen NE; Key, Timothy J; Appleby, Paul N; Spencer, Elizabeth A; Roddam, Andrew W; Neale, Rachel E; Allen, Naomi E (Public Health Nutrition, 2007)