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The authors would like to express their thanks to Helge Waal (Norway), Kirsten Frederik-sen (Denmark), Ulf Malmstrom (Sweden) and Valgerður Runarsdottir (Iceland) for searching data on Nordic countries, and to Anssi Vartiainen, Aila Ronkanen, Tarja Koskinen, Mia-Veera Koivisto, Martti Marila, Pasi Lehti, Paivi Martikainen, Tuomo Seppanen, Maiju Hakala-Kallio and Jukka Makinen for collecting the data concerning Finland.

Opioid substitution treatment in Finland and other Nordic countries: Established treatment, varying practices