PPAR agonists as add-on treatment with metformin in management of type 2 diabetes: a systematic review and meta-analysis oleh Saif Alnuaimi, Tea Reljic, Fatima S. Abdulla, Hamda Memon, Sarah Al-Ali, Teagen Smith, Fadila Serdarevic, Zelija Velija Asimi, Ambuj Kumar, Sabina Semiz