“…Then, the FNS effect has be calculated using tabulated nuclear data [ 40 ] for root‐mean‐square radius values, with a Fermi or even with a deformed Fermi nuclear potential, [ 28,41 ] or with more realistic predictions based on the Skyrme‐type nuclear potential, [ 42 ] not forgetting about the nuclear deformation correction. [ 38 ] There is room for an improvement in the evaluation of the FKS effect as well, from a simple two‐sphere model to a more sophisticated and realistic one. The higher‐order QED effects, such as self‐energy, Wichmann–Kroll, Källén–Sabry, muonic and hadronic Uehling potentials [ 16,41,43 ] should be also included.…”