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Zinka, B., Epple, S., Schick, S., Skopp, G., Graw, M., & Musshoff, F. (2019). can a threshold for 11‐nor‐9‐carboxy‐Δ9 ‐tetrahydrocannabinol in hair be derived when its respective concentration in blood serum indicates regular use?. Drug testing and analysis, 11(2), 325–330. http://access.bl.uk/ark:/81055/vdc_100084063619.0x000010