"Mixed methods reviews can be identified as reviews that incorporate mixed methods primary studies or, more commonly, as reviews that seek to integrate mixed (quantitative and qualitative) data." (Sutton, 2019)
Sutton, A., Clowes, M., Preston, L., & Booth, A. (2019). Meeting the review family: exploring review types and associated information retrieval requirements. Health Information & Libraries Journal, 36(3), 202-222.