Text and Data Mining valid from 2019-04-04
Received: 6 February 2019
Accepted: 18 March 2019
First Online: 4 April 2019
Compliance with ethical standards
: Each author certifies that no conflict of interest (financial or non-financial) exist in connection with this study.
: The study design was approved by the UEFA Medical Committee and the UEFA Football Development Division.
: All players provided written informed consent prior to participation.