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. 2018 Apr 9;5:59. doi: 10.3389/fvets.2018.00059

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Copyright © 2018 Good, Bakker, Duignan and Collins.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Location of skin regions on right and left sides of animals. Injection sites in each region = +. [Reprinted with permission of the AVMA (Am J Vet Res (1950) 11:301 – Larsen et al. (70))].