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Authors
Liebregts, Nienke https://orcid.org/0000-0001-5929-147X
Rigoni, Rafaela
Petruželka, Benjamin
Barták, Miroslav
Rowicka, Magdalena
Zurhold, Heike
Schiffer, Katrin
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Funding
Funding for this research was provided by:
ZonMw (63200000103)
National Institute for Health Research (PR-ST-0416-10001)
Federal Ministry of Health (ZMVI1-2516DSM222)
Government Council for Drug Policy Coordination and the institutional support Progress (Q06/LF1)
National Bureau for Drug Prevention
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Article History
Received: 13 September 2021
Accepted: 28 March 2022
First Online: 12 April 2022
Declarations
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: Before the interview, all participants provided informed consent and anonymity was guaranteed. In GER, UK, PL and CZ, the study has been reviewed and approved by the respective responsible ethics committee; in NL, no ethical approval was required. The respective reference numbers are as follows: GER: WF-03/17; UK: 17/NE/0283; PL: 160_2017/2018; CZ: 180326_EK-NMS.
: Not applicable.
: The authors declare that they have no competing interests.
