id	keyword
ak-98	et al
ak-98	injuries
ak-98	children
ak-98	risk
ak-98	injury
ak-98	sports
ak-98	study
ak-98	studies
ak-98	factors
ak-98	injury risk
ak-98	activity
ak-98	youth
ak-98	risk factors
ak-98	diener et
ak-98	level
ak-98	emery et
ak-98	age
ak-98	view