What is the burden of proving that a claimant's impairment or combination of impairments meets or exceeds a "listing"?

A claimant bears the burden of proving that his or her impairments satisfy all the criteria of a particular listing. Id. "For a claimant to show that his [or her] impairment matches a listing, it must meet all of the specified medical criteria. An impairment that manifests only some of those criteria, no matter how severely, does not qualify." Sullivan v. Zebley, 493 U.S. 521, 530 (1990) (emphasis in original). If a claimant's impairment or combination of impairments meets or exceeds a "listing," no specific finding is necessary as to the claimant's ability to perform his or her past relevant work or any other jobs. 20 C.F.R. 404.1520(d).