compared to experiment. Recent corrections from radiative recoil of order α(Zα)^{5}m^{2}/M and pure recoil of order (Zα)^{6}m^{2}/M are reviewed. Contributions of order α^{2}(Zα)^{5}m have been calculated from certain classes of diagrams. These are described while other as yet uncalculated terms are mentioned. The largest error in the theory is the uncertain measured value of the proton electromagnetic radius.
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