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Besson, Jacques; Beck, Thilo; Wiesbeck, Gerhard; Hämmig, Robert; Kuntz, André; Abid, Sami; Stohler, Rudolf (2014). Opioid maintenance therapy in Switzerland: an overview of the Swiss IMPROVE study. Swiss medical weekly, 144, w13933. EMH Schweizerischer Ärzteverlag 10.4414/smw.2014.13933