AUTHOR=Justicia-Grande Antonio José , Gómez-Ríal Jose , Rivero-Calle Irene , Pischedda Sara , Curras-Tuala María José , Gómez-Carballa Alberto , Cebey-López Miriam , Pardo-Seco Jacobo , Méndez-Gallart Roberto , Fernández-Seara María José , Salas Antonio , Martinón-Torres Federico TITLE=Corrigendum: Case Report: Two Monochorionic Twins With a Critically Different Course of Progressive Osseous Heteroplasia JOURNAL=Frontiers in Pediatrics VOLUME=9 YEAR=2021 URL=https://www.frontiersin.org/journals/pediatrics/articles/10.3389/fped.2021.807812 DOI=10.3389/fped.2021.807812 ISSN=2296-2360