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Delays in publishing systematic review registrations in PROSPERO are hindering transparency and may lead to research waste
  1. Livia Puljak
  1. Catholic University of Croatia, Zagreb 10000, Croatia
  1. Correspondence to Dr Livia Puljak, Center for Evidence-Based Medicine and Health Care, Catholic University of Croatia, Zagreb 10000, Croatia; livia.puljak{at}; liviapuljak{at}

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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 …

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