Correction: Effectiveness of a Web-Based Tailored Intervention With Virtual Assistants Promoting the Acceptability of HPV Vaccination Among Mothers of Invited Girls: Randomized Controlled Trial - Pot, Mirjam; Paulussen, Theo GWM; Ruiter, Robert AC; Eekhout, Iris; de Melker, Hester E; Spoelstra, Maxine EA; van Keulen, Hilde M (JMIR Publications, 2020)