TY - JOUR AU - Bischoff-Ferrari, HA; Willett, WC; Orav, EJ TI - A pooled analysis of vitamin D dose requirements for fracture prevention JO - N Engl J Med IS - 01 VL - 367 PY - 2012 DO - 10.1056/NEJMoa1109617 L3 - PubMed-ID: 22762317 SP - 40 EP - 9 N1 - et al. ER -