Smith JS, Kepler CK, Kopjar B, Harrop JS, Arnold P, Chapman JR, Fehlings MG, Vaccaro AR, Shaffrey CI:Effect of type II odontoid fracture nonunion on outcome among elderly patients treated without surgery: based on the AOSpine North America geriatric odontoid fracture study.Spine (Phila Pa 1976). 2013 Dec 15;38(26):2240-6. (文献発表形式)     波多野亮