INS and type 2 diabetes mellitus: ((“diabetes mellitus type 2” OR “diabetes mellitus, noninsulin-dependent” OR “diabetes mellitus, non-insulin-dependent” OR “diabetes mellitus, type ii” OR “niddm” OR “type 2 diabetes” OR “dm2” OR “t2dm”) AND (“a2m protein, human” OR “α2-macroglobulin” OR “salivary α2-macroglobulin” OR “α2-mg” OR “alpha 2-macroglobulin” OR “a2mg”))