122 2005n-235 adolescent adverseeffects bacterialinfections causation complications control ethnicgroups ethnicity ethnopsychology freewillanddeterminism greatbritain methodology methods minoritygroups minorityteenagers necessity(philosophy) numericaldata predictiontheory prevention psychologicalaspects psychology qw805i593a2012 research statistics unitedstates vaccination vaccines virusdiseases ws462e8452005