To show the equivalence in terms of efficacy glycated hemoglobin (HbA1c) of glimepiride/metformin slow-release combination tablet (Amaryl M SR 2/500) once daily compared with fixed-dose glimepiride/metformin combination tablet (Amaryl M 1/250) twice a day on HbA1c in patients with type 2 Diabetes Mellitus (DM)