Faculty of Health Studies, Sogn og Fjordane University College, Førde, Norway. Faculty of Health Studies, Sogn og Fjordane University College, Førde, Norway ; Department of Surgery, Førde Central Hospital, Førde, Norway. Department of Sports Medicine, Norwegian School of Sport Sciences, Oslo, Norway ; Faculty of Teacher Education and Sports, Sogn og Fjordane University College, Sogndal, Norway. Faculty of Health Studies, Sogn og Fjordane University College, Førde, Norway ; Department of Chemistry, University of Bergen, Bergen, Norway.