Al-Fatlawy, E.T.N. 2026. Serum Complement C3 and C4 Levels in Patients with Type 2 Diabetes Mellitus in Al-Najaf Province, Iraq: A Case-Control Study. Medical Science Journal for Advance Research. 7, 3 (Sep. 2026). DOI:https://doi.org/10.46966/msjar.v7i3.453.