  The qualitative difference in the use of retarded and Feynman amplitudes as
demonstrated in nucl-th/0101024 had been wrongly considered in this comment.
The concept of the breakdown of crossing symmetry is not effective in the case
considered in the adressed article. The technical aspects of the evaluation of
higher-order corrections which were adressed in the original comment and their
applicability to the total inclusive cross section have been clarified.
