Eligibility criteria
We included CPGs for SCD in pregnancy that: (1) were evidence-based CPGs with a clear and detailed documentation of the CPG development methods; (2) were in English language; (3) were original Source CPGs (de novo developed); (4) were national or international CPGs; (5) published between January 1, 2014 and December 30, 2018 and the search was repeated before the final manuscript submission to identify any new relevant CPGs; (6) were published by an organization or group authorship in a CPG database or peer-reviewed journal. Only the most current version of each Source CPG was included.
We excluded CPGs that were published earlier than 2014, written in a non-English language, adapted from other Source CPG(s), presented as consensus or expert-based statements, or that had a single author.11