Seasonal variation in serum 25-hydroxycholecalciferol concentrations in elderly South African patients with fractures of femoral neck.
D000368:Aged; D004781:Environmental Exposure; D005265:Femoral Neck Fractures / Q000097:blood*; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D012621:Seasons; D013019:South Africa
D006887:Hydroxycholecalciferols