@article{:/content/journals/10.22233/20412495.0116.12, author = "Harris, Karen and Witte, Philip", title = "How to…", journal = "BSAVA Companion", year = "2016", volume = "2016", number = "1", eid = , pages = "12-17", url = "https://www.bsavalibrary.com/content/journals/10.22233/20412495.0116.12", doi = "https://doi.org/10.22233/20412495.0116.12" }