Corrigendum: Platelet Counts and Patent Ductus Arteriosus in Preterm Infants: An Updated Systematic Review and Meta-Analysis - González-Luis, Gema; Ghirardello, Stefano; Bas-Suárez, Pilar; Cavallaro, Giacomo; Mosca, Fabio; Clyman, Ronald I.; Villamor, Eduardo (Frontiers in Pediatrics, 2021)