Methods
A comprehensive search of several databases from each database’s
inception to May 7th, 2020, any language, was conducted. The databases
included Ovid MEDLINE(R) and Epub Ahead of Print, In-Process & Other
Non-Indexed Citations, and Daily, Ovid EMBASE, Ovid Cochrane Central
Register of Controlled Trials, Ovid Cochrane Database of Systematic
Reviews, and Scopus. The search strategy was designed and conducted by
an experienced librarian with input from the study’s principal
investigator. Controlled vocabulary supplemented with keywords was used
to search for mirror syndrome in pregnancy. The actual strategy listing
all search terms used and how they are combined is available in theAppendix .