*2.1. Inclusion Criteria*

According to the JBI recommendations mnemonic "P.C.C." for scoping reviews, the inclusion criteria were: **Participants—**Undergraduate nursing students. **Concept—**Studies exploring nursing students' clinical training changes during the COVID-19 pandemic. **Context—**Any clinical practice setting, independent of the country of the study. **Types of sources—**Studies with quantitative, qualitative, and mixed methods study design. In addition to these, all types of systematic review were considered.

#### *2.2. Search Strategy*

The search strategy was used to identify published and unpublished primary studies and reviews.

Two reviewers developed the search strategy and peer-review by an expert third reviewer who considered the Peer Review of Electronic Search Strategies (PRESS) checklist [16]. The JBI recommended that three-step search strategy was applied [12,14]. Records in English, Spanish, and Portuguese were included to ensure a suitable selection procedure and data extraction.

The search strategy was adapted to the specificities of each information source. The databases searched included MEDLINE (via PubMed); CINAHL Complete (EBSCOhost); Cochrane Central Register of Controlled Trials; Cochrane Database of Systematic Reviews; LILACS; Scopus; and SciELO. The search for unpublished studies included DART-Europe and OpenGrey. As an example, the search strategy used for MEDLINE (via PubMed) is presented in Table 1. The search was structured in both Medical Subject Headings (MeSH) and text words shown in the literature. The terms were combined using truncation symbols and Boolean operators ("OR" and "AND"). Lastly, the reference lists of the articles included in the review were screened for supplementary papers.


**Table 1.** Search strategy for MEDLINE (via Pubmed) conducted on 28 March 2022.

Study languages were restricted to those mastered by the authors—English, Spanish, and Portuguese—to ensure a good-quality selection procedure and data extraction. No time limit was considered in this review. However, the research has considered the COVID-19 pandemic; as such, all the studies included were dated equal to or greater than 2019.

Furthermore, since this scoping review aims to map the changes in clinical training for undergraduate nursing students during the COVID-19 pandemic, no rating of the methodological quality was provided, according to the JBI methodology, and as a result, practice recommendations were provided with caution. As mentioned by JBI "no assessment of methodological quality and formal synthesis takes place as part of a scoping review" [12].
