title: Skeletal maturation and physical fitness of 12 to 15 year old boys.
mesh_terms: D000293:Adolescent; D000365:Age Determination by Skeleton; D000367:Age Factors; D001530:Belgium; D002648:Child; D006128:Growth; D006801:Humans; D008297:Male; D010809:Physical Fitness; D012737:Sex Factors