Search and Screening
We sought English-language articles that used any method to gather and analyze primary, empirical data about the experiences, beliefs or opinions of pregnant people or their partners about cannabis use in pregnancy and lactation (Table 1). A search for published literature was performed by a medical librarian on April 01-02, 2020 using the following databases: MEDLINE, APA PsycINFO, Cumulative Index to Nursing and Allied Health Literature (CINAHL), Social Science Citation Index (SSCI), Social Work Abstracts, ProQuest Sociology Collection (including Sociological Abstracts). Grey literature searching was confined to theses, searched through the ProQuest Dissertation Abstracts database.
The search strategy (Appendix 1) comprised both controlled vocabulary and keywords and was peer-reviewed according to the PRESS checklist (Peer Review of Electronic Search Strategies). No limits to date or study design were applied. We also conducted a hand-search of eight relevant journals, described in Appendix 1.
Four reviewers (JP, AP, ST, MV) screened the titles and abstracts of all citations based on the eligibility criteria (Table 1). Full text articles were reviewed when more information was necessary to determine eligibility. Each article was screened independently by two reviewers and discrepancies were resolved through discussion with a third reviewer until consensus was reached. After identifying eligible articles, we traced citations forwards and backwards to identify additional eligible articles. PRISMA diagram depicting article selection process is in Figure 1.