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. 2019 Jan 3;5:1. doi: 10.1186/s40942-018-0153-8

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Images from syringes 1 [Saldanha Rodrigues (SR) 1-mL insulin syringe, a–d], 2 [Becton–Dickinson (BD) Plastipak 1-mL insulin syringe, e–h], and 3 [BD Safetyglide insulin syringe, i–l]. In syringe 1, oil droplets are seen in all groups: a Isolated silicone oil droplet in a positive control without agitation (group 1). b Multiple silicone oil droplets in a positive control with agitation (group 2). c Isolated silicone oil droplet in fluid-only without agitation (group 3). d Multiple silicone oil droplets in fluid-only with agitation (group 4). In syringe 2, no oil is seen in groups 3 and 4: e Positive control without agitation (group 1). f A positive control with agitation (group 2). g Fluid-only without agitation (group 3). h Fluid-only with agitation (group 4). In syringe 3, silicone oil is seen in three groups. i Isolated silicone oil droplet in a positive control without agitation (group 1). j Multiple silicone oil droplets in a positive control with agitation (group 2). k No silicone oil droplet in fluid-only without agitation (group 3). l Four silicone oil droplets in fluid-only with agitation (group 4)