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In the comment we discuss an additional term to the $\alpha^3$ correction tothe Lamb shift, which was missed in the calculation by Kinoshita and Nio (Phys.Rev. Lett. 82, 3240 (1999)).

Comment on "Sixth-Order Vacuum-Polarization Contribution to the Lamb  Shift of Muonic Hydrogen" by T. Kinoshita and M. Nio, Phys. Rev. Lett. 82,  3240 (1999)