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Some practitioners run continuous protocols, but cycling remains the conservative approach until more long-term data exists

As the reason for selecting men as donors is often unstated, we can only infer that it may be because men have larger apocrine glands and produce more intense axillary odour than women (Doty et al., Reference Doty, Orndorff, Leyden and Kligman1978), thus making it more likely to find hypothesised effects (although this would not be an explanation for those studies that ensure odours are presented at, or just below, threshold concentration)

Acknowledgements The authors would like to thank Fondazione Pisana per la Scienza for funding