Affiliation: | a Centre for Research in Childhood Health, Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmarkb Institute of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmarkc Department of Sports Medicine, Norwegian School of Sports Sciences, Sognsveien 220, NO-0806 Oslo, Norway |