?? ????? ??? ????? ?? ??????? ??????? ??????? ??????? ?? ????? ?? ???? ????? ??????.Constant data (if readily available) would be entered into RevMan 5.0 employing the right statistic. Research have been assessed for quality using the Oxford Quality Scale (Jadad 1996). Sub group analysis was undertaken for dose of pregabalin and type of painful aff