Corrigendum: Muramyl Endopeptidase Spr Contributes to Intrinsic Vancomycin Resistance in Salmonella enterica Serovar Typhimurium - Vestö, Kim; Huseby, Douglas L.; Snygg, Iina; Wang, Helen; Hughes, Diarmaid; Rhen, Mikael (Frontiers in Microbiology, 2019)