On 2017 Jan 06, Melissa Rethlefsen commented:

Though the authors clearly recognize a need to search multiple databases to gather as many relevant references as possible, a major concern is that the information sources listed as searched in this article are largely not databases, but database platforms.

The authors searched "Scopus, EBSCOhost, Ovid, and Web of Science platforms." Of those four, only Scopus is a unique database. EBSCOhost is a platform that contains many different databases. I counted 71 beginning with the letter "A" on their title list: https://www.ebscohost.com/title-lists Ovid is similarly a platform with many different database options, though not quite as many as on EBSCOhost. Ovid has "over 100" different database options: http://www.ovid.com/site/catalog/databases/index.jsp Web of Science similarly is a platform with multiple database offerings (22 of them, with different date range options available): http://thomsonreuters.com/en/products-services/scholarly-scientific-research/scholarly-search-and-discovery/web-of-science.html

Unfortunately, this article does not include a replicable search strategy in the text or in a supplementary document, so it is not possible to guess what databases might have been used, or what search strategies were used to search them. Because this is a mixed methods review and did not have an established protocol, it may be unreasonable to expect the authors to report their search methods as stringently as in a "true" systematic review, but since the authors claim a systematic review, it would have been appropriate to document and report the search methods according to known standards (i.e., PRISMA, MOOSE).

This study might have benefited from the inclusion of a librarian or information specialist on the team to improve documentation and reporting of the key methodology used to conduct this work. Additional peer review from librarians and information specialists may help identify reporting concerns, including lack of search detail and details about information sources utilized.

On 2017 Jan 06, Melissa Rethlefsen commented:

Though the authors clearly recognize a need to search multiple databases to gather as many relevant references as possible, a major concern is that the information sources listed as searched in this article are largely not databases, but database platforms.

The authors searched "Scopus, EBSCOhost, Ovid, and Web of Science platforms." Of those four, only Scopus is a unique database. EBSCOhost is a platform that contains many different databases. I counted 71 beginning with the letter "A" on their title list: https://www.ebscohost.com/title-lists Ovid is similarly a platform with many different database options, though not quite as many as on EBSCOhost. Ovid has "over 100" different database options: http://www.ovid.com/site/catalog/databases/index.jsp Web of Science similarly is a platform with multiple database offerings (22 of them, with different date range options available): http://thomsonreuters.com/en/products-services/scholarly-scientific-research/scholarly-search-and-discovery/web-of-science.html

Unfortunately, this article does not include a replicable search strategy in the text or in a supplementary document, so it is not possible to guess what databases might have been used, or what search strategies were used to search them. Because this is a mixed methods review and did not have an established protocol, it may be unreasonable to expect the authors to report their search methods as stringently as in a "true" systematic review, but since the authors claim a systematic review, it would have been appropriate to document and report the search methods according to known standards (i.e., PRISMA, MOOSE).

This study might have benefited from the inclusion of a librarian or information specialist on the team to improve documentation and reporting of the key methodology used to conduct this work. Additional peer review from librarians and information specialists may help identify reporting concerns, including lack of search detail and details about information sources utilized.