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PROSPERO is an international prospective registry of systematic reviews.1 Registering a systematic review prospectively is considered a good research practice for multiple reasons, including transparency of the planned methods and prevention of unnecessary duplication of effort. Solla et al 2 recently reported concerns that PROSPERO registration may not prevent double review on the same topic because the PROSPERO search engine is apparently failing in finding similar review projects.
Another pertinent current problem of PROSPERO may hinder intended transparency and promote research waste and duplication efforts, namely, major delays in checking and publishing registrations that the PROSPERO is experiencing.1 …
Contributors LP designed and wrote the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.