Final answer:
A meta-synthesis is the type of systematic review that incorporates only qualitative studies, differentiating it from meta-analysis, narrative reviews, and case control reports.
Step-by-step explanation:
The type of systematic review that includes only qualitative studies is meta-synthesis. A meta-analysis aggregates quantitative studies to compute an overall effect size. Narrative reviews are general overviews of a topic without a systematic search and synthesis of the literature, and can include a mix of study types. Case control reports are a type of observational study that compares subjects with a trait of interest to a control group without the trait, often relying on retrospective data and can include qualitative elements. However, a meta-synthesis exclusively focuses on integrating and interpreting qualitative research findings to create new insights and understandings.