For in-depth literature searching:
A review of the literature is often necessary in order to survey and analyze current (you determine time frame) literature relating to a particular issue, problem, theory, methodology, model, framework, etc.
A thorough literature review involves a comprehensive search of all known/findable scholarly literature that addresses the topic. In some cases other types of sources, such as books or book chapters, theses or dissertations, “gray literature” such as technical reports, documents, media, social media, or conversations may also be appropriate.
The written review provides a summary and analysis of this literature in order to put research into a context, to explain what has been done to date, and/or to identify gaps or missing elements.
A refereed or peer reviewed publication is one that has been evaluated by experts the field prior to publication. Refereed materials are significant to the research and the literature of most academic fields because they assure readers that the information conveyed is reliable and timely.
In contrast, articles submitted to non-refereed materials such as Trade Journals or Magazines are accepted or rejected based on the judgement of the editor.
The term "scholarly publication" is often used to describe refereed materials, but this term is not exclusive to refereed material. Non-refereed materials may not by scrutinized as intensely as refereed materials, but they can still be considered scholarly.
Most biomedical research is reported/published in academic or scholarly (refereed) publications and and the articles have completed the peer-review process.
To determine if a journal is refereed, you can;