A stepped-wedge cluster randomized trial designed to improve completion of HPV vaccine series and reduce missed opportunities to vaccinate in rural primary care practices oleh Patricia A. Carney, Brigit Hatch, Isabel Stock, Caitlin Dickinson, Melinda Davis, Rex Larsen, Steele Valenzuela, Miguel Marino, Paul M. Darden, Rose Gunn, Laura Ferrara, Lyle J. Fagnan