Boolean Operators
To make the search more precise, we can use boolean operators in databases between our keywords.
We use boolean operators to focus on a topic, particularly when this topic contains multiple search terms, and to connect various pieces of information in order to find exactly what we are looking for.
Boolean operators connect the search words to eithe.
,
Cochrane Central
The Cochrane Central Register of Controlled Trials (CENTRAL) is a database of reports of randomized and quasi-randomized controlled trials.
Most records are obtained from the bibliographic databases PubMed and Embase, with additional records from the published and unpublished sources of CINAHL, ClinicalTrials.gov, and the WHO’s International Clinic.
,
Embase
Embaseis considered the second most popular database after MEDLINE.
More than 32 million records from over 8,200 journals from more than 95 countries, and ‘grey literature’ from over 2.4 million conference abstracts, are estimated to be in the Embase content.
Embase contains subtopics in health care such as complementary and alternative medicine, p.
,
Lilacs
The most important index of the technical-scientific literature in Latin America and the Caribbean, LILACS, was created in 1985 to record scientific and technical production in health.
It has been maintained and updated by a network of more than 600 institutions of education, government, and health research and coordinated by Latin America and Cari.
,
PubMed
PubMedwas launched in 1996 and, since June 1997, provides free and unlimited access for all users through the internet. PubMed database contains more than 30 million references of biomedical literature from approximately 7,000 journals.
The largest percentage of records in PubMed comes from MEDLINE (95%), which contains 25 million records from over.
,
ScienceDirect
ScienceDirect is Elsevier’s most important peer-reviewed academic literature platform.
It was launched in 1997 and contains 16 million records from over 2,500 journals, including over 250 Open Access publications, such as Cell Reports and The Lancet Global Health, as well as 39,000 eBooks.
ScienceDirect topics include: 1. health sciences; 2. life s.
,
What is the next step in a literature review?
Searching the extant literature:
The next step consists of searching the literature and making decisions about the suitability of material to be considered in the review ( Cooper 1988 ).
There exist three main coverage strategies.