The following databases were searched from January 2005 to March 2013: MEDLINE, MEDLINE In-process, EMBASE; CDSR, DARE, HTA, NHSEED, CENTRAL; Science Citation Index and Conference Proceedings Citation Index-Science.
We will search several bibliographic databases (eg,PubMed, EMBASE, CINAHL, CENTRAL, Science Citation Index, Africa-Wide Information and WHOLIS electronic databases and search sources for grey literature.
We will search for published and unpublished randomised controlled trials and non-randomised controlled trials in PubMed, Scopus, CINAHL, CENTRAL, Science Citation Index, WHOLIS, Clinicaltrials.gov and the WHO International Clinical Trials Platform.
We searched the African Index Medicus, CENTRAL, Conference Proceedings Citation Index, EMBASE, Global Health, ICTRP, IndMED, LILACS, MEDLINE, metaRegister of Controlled Trials, ProQuest Dissertations & Theses Database and WHOLIS in December 2012 and January 2013 (see online supplementary appendix 1).
CENTRAL includes citations to reports of controlled trials that might not indexed in MEDLINE, EMBASE or other bibliographic databases; citations published in many languages; and other sources that are difficult to access[ 19].
We systematically searched the following electronic bibliographic databases from their inception until 1 January 2012: Medline including PreMedline, Embase, BIOSIS Previews, Cochrane CENTRAL, Conference Proceedings Citation Index-Science, Google Scholar, ProQuest Dissertation Abstracts, Scopus, and Science Citation Index Expanded.
The PubMed Central archived article citation resource indicates that 3 of the 56 retracted papers have been cited in books — one after being retracted.
npj Vaccines is listed within leading abstracting and indexing services including Scopus, PubMed Central, PubMed, Science Citation Index Expanded (SCIE), Biological Abstracts, BIOSIS Previews and Directory of Open Access Journals (DOAJ).
Database searches were conducted in 2012 (in MEDLINE, MEDLINE in Process, EMBASE, CENTRAL, Conference Proceedings Citation Index Science, and Social Science and Humanities) using the various terms for individualisation (table 1).
Department of Defense's central resource for citations and/or full text of journal articles, technical reports, and other DoD- and government-funded publications about military and naval science, operational warfare, joint planning, and many other defense-related topics.
CENTRAL also includes citations to reports of controlled trials that are not indexed in MEDLINE or EMBASE, derived through searches of other bibliographic databases, and extensive hand searching.
