Orangeburg, 363 S.C. 19, 25-26, 609 S.E.2d 506, 509 (2005) (???Qualification of an expert and the admission or exclusion of his testimony is a matter within the sound discretion of the trial court . . . the trial court???s decision will not be disturbed on appeal absent an abuse of discretion.???). ???Expert medical testimony is designed to aid the Commission in coming to the correct conclusion; t