RT Journal Article SR Electronic(1) A1 Tappin, Simon YR 2018 T1 How to… JF BSAVA Companion VO 2018 IS 2 SP 16 OP 19 DO https://doi.org/10.22233/20412495.0218.16 UL https://www.bsavalibrary.com/content/journals/10.22233/20412495.0218.16