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- Physical Fitness (3)
- Adolescence (1)
- Canada Fitness Survey (1)
- Growth - in adolescence (1)
- Health Surveys - Canada (1)
- Health Surveys - Netherlands (1)
- Longitudinal Studies (1)
- Occupational Diseases - prevention & control (1)
- Occupational Medicine - economics (1)
- Physical Education and Training - Netherlands (1)