title: Letter that questions OCF requires no response.
authors.forename: R C
authors.initials: RC
authors.lastname: MacDonald
mesh_terms: D006801:Humans; D008349:Manipulation, Orthopedic / Q000379:methods*; D010021:Osteopathic Medicine / Q000379:methods; D012680:Sensitivity and Specificity; D012886:Skull