School-based intervention for the prevention of HPV among adolescents: a cluster randomised controlled study
Maria Grandahl, Andreas Rosenblad, Christina Stenhammar, Tanja Tydén, Ragnar Westerling, Margareta Larsson, Marie Oscarsson, Bengt Andrae, Tina Dalianis, Tryggve Nevéus
BMJ Open Jan 2016, 6 (1) e009875; DOI: 10.1136/bmjopen-2015-009875