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Winstock, Adam and Davies, Emma L and Gilchrist, Gail and Zhuparris, A and Ferris, Jason and Maier, Larissa and Barratt, Monica J (2020) GDS special edition on Covid-19 interim report global. Global drugs survey.
Winstock, Adam R and Timmerman, C and Davies, E and Maier, LJ and Zhuparris, A and Ferris, JA and Barratt, Monica J and Kuypers, KPC (2021) Global drug survey (GDS) 2020 psychedelics key findings report. London: Global Drug Survey.