In a clinical environment, Evidence Based Practice (EBP) is a thoughtful integration of the best available evidence, coupled with clinical expertise.
Silagy and Haines (1998) describe evidence-based health care as an approach that 'takes account of evidence at a population level as well as encompassing interventions concerned with the organisation and delivery of health care'.
Silagy, C & Haines, A 1998, Evidence-based practice in primary care, London, BMJ Books.
There are several different kinds of articles frequently found in the literature for medical and health sciences.
Source: Booth A & Brice A (2004) Evidence Based Practice for Information Professionals: A Handbook. London: Facet Publishing.
Randomized controlled trials, systematic reviews, and meta-analyses are considered to be stronger forms of evidence and will be more desirable for your final paper.