1. Department of Ophthalmology; Odense University Hospital; Odense Denmark
2. Department of Clinical Research; Faculty of Health Sciences; University of Southern Denmark; Odense Denmark
3. Department of Ophthalmology; Rigshospitalet-Glostrup University Hospital; Copenhagen Denmark
4. Danish Institute for Myopia Research; Vedbaek Denmark
5. Centre of Research in Childhood Health; Research Unit for Exercise Epidemiology; Department of Sports Science and Clinical Biomechanics; University of Southern Denmark; Odense Denmark
6. CAPES Foundation; Ministry of Education of Brazil; Brasília Brazil
7. Centre for Public Health; Queen's University Belfast; Belfast United Kingdom
8. Sport Medicine Clinic; The Orthopedic Department; Hospital of Middelfart; Institute of Regional Health Services Research; University of Southern Denmark; Middelfart Denmark