Petkov VI, Miller DP, Howlader N, Gliner N, Howe W, Schussler N, Cronin K, Baehner FL, Cress R, Deapen D, Glaser SL, Hernandez BY, Lynch CF, Mueller L, Schwartz AG, Schwartz SM, Stroup A, Sweeney C, Tucker TC, Ward KC, Wiggins C, Wu XC, Penberthy L, Shak S. Erratum: Author Correction: Breast-cancer-specific mortality in patients treated based on the 21-gene assay: a SEER population-based study. NPJ Breast Cancer. 2018; 4:17.