ดังนั้นผู้วิจัยทำได้เพียงทบทวนวรรณกรรมอย่างเพียงพอเพื่อสนับสนุนว่า a new psychoeducational intervention น่าจะให้ผลลัพท์ที่ดีกว่า a well-established usual care
So the researchers can only review the literature to support that new a psychoeducational intervention likely to give better results a well-established usual care.
Thus, the researchers could only peer-reviewed literature adequate to support a new psychoeducational intervention that will make the results better than a well-established usual care.