A2M and 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”