RT Article T1 Youth ice hockey concussions reported at US emergency departments from 2002-2016: A peak in 2011 and the impact of rule modifications JF Orthopaedic journal of sports medicine VO 7 A1 Morrissey, Patrick A2 Urban, William P. A2 McCarthy, Matthew T. A2 Newman, Jared M. A2 Chatterjee, Dipal A2 Aylyarov, Alex A2 Bloom, Lee R. A2 Zhou, Jack J. A2 Hayden, Andrew J. A2 Shah, Neil V. LA English YR 2019 UL https://krimdok.uni-tuebingen.de/Record/1912753456 DO 10.1177/2325967119S00401