The structural and organizational aspects of human papillomavirus vaccine affecting immunization coverage in Europe: a systematic review. - Valdecantos, Ronan Lemwel; Sorrentino, Michele; Mercogliano, Michelangelo; Giordano, Vincenzo; Trama, Ugo; Triassi, Maria; Palladino, Raffaele (BMC Public Health, 2025)