NMM/OMTCommentary The Fundamental Frequency: A New Approach to Concussion Diagnosis in Children Brett Ostrander, OMS IV, and Janice Blumer, DO Notes and Affiliations Notes and Affiliations Published: May 1, 2017 J Osteopath Med; 117(5): 336-337 https://doi.org/10.7556/jaoa.2017.065