RT Journal Article SR Electronic(1) A1 Humm, Karen YR 2009 T1 How to… JF BSAVA Companion VO 2009 IS 9 SP 12 OP 15 DO https://doi.org/10.22233/20412495.0909.12 UL https://www.bsavalibrary.com/content/journals/10.22233/20412495.0909.12