Effect of Training Pediatric Clinicians in Human Papillomavirus Communication Strategies on Human Papillomavirus Vaccination Rates: A Cluster Randomized Clinical Trial. - Szilagyi PG; Humiston SG; Stephens-Shields AJ; Localio R; Breck A; Kelly MK; Wright M; Grundmeier RW; Albertin C; Shone LP; Steffes J; Rand CM; et al. (JAMA pediatrics, 2021)