Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: author="Keller, Katja" or (type any "bookEditor issueEditor" and editor="Keller, Katja") Add to list Journal Article A1 open access The Youth Fitness International Test (YFIT) battery for monitoring and surveillance among children and adolescents : a modified Delphi consensus project with 169 experts from 50 countries and territories Francisco B. Ortega, Kai Zhang, Cristina Cadenas-Sanchez, Mark S. Tremblay, Gregor Jurak, Grant R. Tomkinson, Jonatan R. Ruiz, Katja Keller, Christine Delisle Nyström, Jennifer M. Sacheck, et al. (2025) JOURNAL OF SPORT AND HEALTH SCIENCE. 14.