Vitamin supplement use among children with Down's syndrome and risk of leukaemia: a Children's Oncology Group (COG) study.
Blair CK, Roesler M, Xie Y, Gamis AS, Olshan AF, Heerema NA, Robison LL, Ross JA. Vitamin supplement use among children with Down's syndrome and risk of leukaemia: a Children's Oncology Group (COG) study. Paediatr Perinat Epidemiol. 2008 May; 22(3):288-95.