Table 1 Exclusion criteria: the specific exclusion criteria for materials

- Materials that do not fit into at least one of the pre-determined themes

- Materials that are not open access

- Materials that have a cost implication/charge an access fee

- Materials that are not from a reputable organisation or course provider, e.g. an unaccredited blog or materials based on a personal or biassed opinion

- Materials that are not in a suitable format