Disfungsi imun selular pada diabetes melitus tipe 2: kajian terhadap kadar indolemaine 2,3-dioxygenase, TNF-alfa, IL-6, IFN-gamma, dan IL-10 dari kultur peripheral blood mononuclear cells = Cellular immunity dysfunction in type 2 diabetes melitus: focus on indoleamine 2,3-dioxygenase, TNF-alpha, IL-6, IFN-gamma, and IL-10 from peripheral blood mononuclear cells