Waldén, M.
Hägglund, M.
Bengtsson, H.
Ekstrand, J.
Article History
First Online: 12 April 2018
Compliance with ethical guidelines
:
: M. Waldén, M. Hägglund, H. Bengtsson and J. Ekstrand declare that they have no competing interests.
: The study protocol was approved by the UEFA Football Development Division and the UEFA Medical Committee. Written informed consent was obtained from all individual participants included in the study.