ADA and diabetes mellitus: The recruited participants had normal serum ADA levels of 13.6 (11.1–16.9) U/L, diabetes duration of 78.64 ± 74.45 months, ages of 58.17 ± 13.12 years, BMI of 25.75 ± 3.58 kg/m2 and HbA1c levels of 9.02 ± 4.43%.