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. 2020 Nov 25;44:1361–1368. doi: 10.1016/j.matpr.2020.11.505

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Fig. 1 — (a) Conventional (C,R) and 3D printed (1,2,3,4) swabs (b) Swab heads close-ups (c) Gram stains of cheek swabs with 3D printed (bottom) and Conventional (top) swabs (d) Material testing of the swabs [33].