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Darvall, J., von Ungern-Sternberg, B. S., Braat, S., Story, D., Davidson, A., Allen, M., Tran-Duy, A., Middleton, D., & Leslie, K. (2019). chewing gum to treat postoperative nausea and emesis in female patients (CHEWY): rationale and design for a multicentre randomised trial. BMJ open, 9(6), . http://access.bl.uk/ark:/81055/vdc_100135155761.0x000009