Corrigendum: Fake News or Weak Science? Visibility and Characterization of Antivaccine Webpages Returned by Google in Different Languages and Countries - Arif, Nadia; Al-Jefri, Majed; Bizzi, Isabella Harb; Perano, Gianni Boitano; Goldman, Michel; Haq, Inam; Chua, Kee Leng; Mengozzi, Manuela; Neunez, Marie; Smith, Helen; Ghezzi, Pietro (Frontiers in Immunology, 2019)