Concussion Symptom Characteristics and Resolution in 20 United States High School Sports, 2013/14–2017/18 Academic Years. (18th November 2021) - Chandran, Avinash; Kerr, Zachary Y; Roby, Patricia R; Nedimyer, Aliza K; Arakkal, Alan; Pierpoint, Lauren A; Zuckerman, Scott L