Health And Performance Promotion in Youth Sport (HAPPY): Concussion Incidence Rates, Initial Management, Symptoms, and Missed Activities in Danish Youth Handball Players. - Pedersen, Lisbeth Lund; Hartvigsen, Jan; Bjerg, Morten; Carstensen, Søren; Møller, Merete (Journal of Orthopaedic & Sports Physical Therapy, 2025)