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School-based intervention for the prevention of HPV among adolescents: a cluster randomised controlled studyGrandahl, Maria; Rosenblad, Andreas; Stenhammar, Christina; Tydén, Tanja; Westerling, Ragnar; Larsson, Margareta; Oscarsson, Marie; Andrae, Bengt; Dalianis, Tina; Nevéus, Tryggve · BMJ Open · 2016