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Korf, Dirk and Benschop, Annemieke and Werse, Bernd and Kamphausen, Gerrit and Felvinczi, Katalin and Dabrowska, Katarzyna and Hernriques, Susana and Nabben, Ton and Wieczorek, Lukasz and Bujalski, Michal and Kalo, Zsusza and Hearne, Evelyn and Van Hout, Marie Claire (2021) How and where to find NPS users: a comparison of methods in a cross-national survey among three groups of current users of new psychoactive substances in Europe. International Journal of Mental Health and Addiction , 19 , pp. 873-890.