Search strategy

A systematic search strategy was created for the concepts of recurrent pregnancy loss and body mass index. The search strategies were launched in PubMed (MEDLINE) 1946-, Embase (Elsevier) 1947-, Scopus (Elsevier) 1823-, and the Cochrane Library (Wiley). The search strategies for the Embase, Cochrane, and Scopus, databases were adapted from the MEDLINE search strategy. All databases were searched back to their inception and no language or date limits were applied. Searches were completed June 2019. The full strategies are available in Supplemental figure 1. All results were exported to Rayyan. The automatic duplicate finder was applied, and duplicates were removed, resulting in a total of 892 unique citations. No additional studies were identified by reviewing the references of included studies.