Paez A. Gray literature: An important resource in systematic reviews. J Evid Based Med. 2017 Aug; 10(3):233-2 Systematic reviews are publications that provide a state-of-art synthesis of evidence on any given research question. While clinical trials and large studies are analysed to synthesize evidence, you cannot afford to ignore gray literature. The concept of Gray literature is described in this article as “that which is produced on all levels of government, academics, business and industry in print and electronic formats, but which is not controlled by commercial publishers”. Simply put, gray literature comprises the whole collection of research works that have…