A common methylenetetrahydrofolate reductase (C677T) polymorphism is associated with low bone mineral density and increased fracture incidence after menopause:longitudinal data from the Danish osteoporosis prevention study. - Abrahamsen,B.; Madsen,JS.; Tofteng,CL.; Stilgren,L.; Bladbjerg,EM.; Kristensen,SR. (J Bone Miner Res, 2003)