Reviews are published in peer-reviewed Research Journals, and typically apply formally-defined analytical protocols in order to synthesize scientific knowledge or evidence derived from a well-defined set of related Studies.
Thomas Williams, MRCPCH, Harish Nair, MD, PhD, Judith Simpson, MD, Nicholas Embleton, MD. (2016). Use of Donor Human Milk and Maternal Breastfeeding Rates. A Systematic Review. Journal of Human Lactation 32(2) : 212-220. https://doi.org/10.1177/0890334416632203