Systematic review of metformin monotherapy and dual therapy with sodium glucose co-transporter 2 inhibitor (SGLT-2) in treatment of type 2 diabetes mellitus - Molugulu, N; Yee, L S; Ye, Y T; Khee, T C; Nie, L Z; Yee, N J; Yee, T K; Liang, T C; Kesharwani, P (Diabetes Res Clin Pract, 2017)