@article{:/content/journals/10.22233/20412495.0221.16, author = "Polson, Sally and Yates, David", title = "How to...", journal = "BSAVA Companion", year = "2021", volume = "2021", number = "2", eid = , pages = "16-23", url = "https://www.bsavalibrary.com/content/journals/10.22233/20412495.0221.16", doi = "https://doi.org/10.22233/20412495.0221.16" }