Örtqvist, M., Roos, E. M., Broström, E. W., Janarv, P.-M., & Iversen, M. D. (2012). Development of the Knee Injury and Osteoarthritis Outcome Score for Children (KOOS-Child). Acta Orthopaedica, 83(6), 666–673. https://doi.org/10.3109/17453674.2012.747921