No nos olvidemos de PRISMA-P Translated title: Let's not forget about PRISMA-P

Systematic reviews should build on a protocol that describes the rationale, hypothesis, and planned methods of the review; few reviews report whether a protocol exists. Detailed, well-described protocols can facilitate the understanding and appraisal of the review methods, as well as the detection of modifications to methods and selective reporting in completed reviews. We describe the development of a reporting guideline, the Preferred Reporting Items for Systematic reviews and Meta-Analyses for Protocols 2015 (PRISMA-P 2015). PRISMA-P consists of a 17-item checklist intended to facilitate the preparation and reporting of a robust protocol for the systematic review. Funders and those commissioning reviews might consider mandating the use of the checklist to facilitate the submission of relevant protocol information in funding applications. Similarly, peer reviewers and editors can use the guidance to gauge the completeness and transparency of a systematic review protocol submitted for publication in a journal or other medium.

PROSPERO is an international database of systematic review protocols produced by the University of York's Center for Research and Dissemination and funded by the National Institute for Health Research. It contains protocols of systematic reviews on health and social care, welfare, public health, education, crime, justice, and health-related international development. PROSPERO compiles a comprehensive listing of systematic review protocols in an attempt to avoid duplication of effort, reduce reporting bias, and promote transparency.