A<unk>  is a literature<unk>  focused on a single question which tries to identify, appraise, select and synthesize all high quality research evidence relevant to that question.<unk> s are generally regarded as the highest level of medical evidence by evidence-based medicine professionals. An understanding of<unk> s and how to implement them in practice is becoming mandatory for all professionals involved in the delivery of health care.
Systematic review
Cohort study
Longitudinal study
Meta-analysis
Agent study
Action study
Clinical trial
Risk factor template