TY - JOUR T1 - Vitamin D for influenza JF - Canadian Family Physician JO - Can Fam Physician SP - 507 LP - 507 VL - 61 IS - 6 AU - Gerry Schwalfenberg Y1 - 2015/06/01 UR - http://www.cfp.ca/content/61/6/507.abstract N2 - ER -