[Questionable journals and how to avoid them].

The purpose of this review is to provide an overview of tools, which health-science researchers can use when assessing, whether a journal is legitimate or questionable. Researchers are regularly contacted by journals encouraging them to submit manuscripts. Many of these contacts are phishing e-mails sent by questionable journals, who offer the publication of manuscripts for a fee but without performing peer review or carrying out other processes normally associated with a scientific journal. Determining whether a journal is questionable or legitimate can be challenging.