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Contributors BD planned the study, oversaw the HPLC and wrote the letter. AR performed and analysed the GC-MS data. MC performed and analysed the HPLC data. EN helped plan and design the GC-MS method, and assisted in editing the letter. PT designed the study, contributed to writing the letter and oversaw the project.
Funding This work was supported by the National Institutes of Health grant number R011DA036493 and a National Science Foundation Predoctoral Fellowship to BD.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.