In Ref. 1, herein referred to as I, labels designating the crystal structures under consideration were omitted from some figures, which could be a source of confusion. Moreover, superconducting parameters necessary to estimate critical temperatures, Tc, were calculated using the nonweighted phonon density of states, F (ω), rather than the proper normalized weighting function of the Eliashberg theory,2 g(ω). In this Erratum, we first review the theoretical background for calculating the parameters needed to estimate Tc, in particular their evaluation using g(ω). We then present and discuss results analogous to Figs. 4, 5, and 13 of I with revised calculations and including crystal-structure labels. Finally, we provide a brief summary of the differences between calculations. In order to evaluate the McMillan formula2,3 or the Allen-Dynes equation4 to estimate Tc, Eqs. (2) and (3) of I, respectively, we must determine λ, 〈ω〉, ω2, ωln, and μ∗; these correspond to the attractive electron-phonon-induced interaction, the first and square root of the second moments of g(ω), the logarithmic average phonon frequency [i.e., ln(ωln) = 〈lnω〉], and the renormalized Coulomb repulsion, respectively. As in I, below we take the approximate, yet reasonable,5 value of 0.089 for μ∗. Further, λ is a direct measure of the strength of the electron-phonon spectral function α2F (ω), which is readily calculable via ab initio calculations,6