240 Appendices Search methods This systematic review was reported in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) statement (www.prisma-statement.org) (Page et al., 2021). A comprehensive search was performed in the bibliographic databases PubMed, Embase.com, APA PsycInfo (via Ebsco), the International Bibliography of the Social Sciences (via ProQuest) and Scopus from inception to December 21st, 2022, in collaboration with a medical librarian (LSc). Search terms included controlled terms (MeSH in PubMed, Emtree in Embase and Thesaurus terms in PsycInfo and in IBSS) as well as free text terms. The following terms were used (including synonyms and closely related words) as index terms or free-text words: ‘mental disorders’ and ‘social support’ and ‘mentoring’ and ‘clinical trials’. The searchwas performedwithout filters, date and language restrictions. Duplicate articles were excluded by a medical information specialist (LSc) using Endnote X20.0.1 (Clarivatetm), following the Amsterdam Efficient Deduplication (AED)-method and the Bramer-method (Bramer, Giustini, de Jonge, Holland, & Bekhuis, 2016; Otten, de Vries, & Schoonmade, 2019). Search results Database Results PubMed 3557 Embase.com 5009 PsycInfo (Ebsco) 2244 IBSS (ProQuest) 5134 Scopus 248 Total 16192 After first deduplication 9491 After deduplication in Rayyan (Ouzzani, Hammady, Fedorowicz, & Elmagarmid, 2016) 9459
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