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. 2022 Mar 8;32(1):26–33. doi: 10.1136/bmjqs-2021-014438

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© Author(s) (or their employer(s)) 2023. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Study flow diagram. Each participant was given 10 sets of syringes in the form of five TML-coded and five non-TML-coded sets. The order of the 10 sets was randomly permuted by block randomisation. TML, tall man lettering. Figure created by the authors and approved by all authors.