Funding for this research was provided by:
European Union’s Seventh Framework Programme (603111)
Polish Ministry of Science and Higher Education (3202/7PR/2014/2)
Received: 11 October 2018
Accepted: 15 August 2019
First Online: 29 August 2019
Ethics approval and consent to participate
: The research teams in all participating countries obtained ethical approval from their respective ethics committees. The Netherlands and Italy were exceptions, as the consulted ethics committees in these countries judged that no formal ethics approval was needed and provided waivers. Belgium: Commissie Medische Ethiek UZBrussel (B.U.N. 14321422845), 17/12/2014. England: NHS – NRES Committee North West-Haydock (15/ NW/0205), 10/03/2015. Finland: Terveyden jahyvinvoinnin laitos, Institutet för hälsa och välfärd (1/2015) 2/2/2015. Italy: Universita Cattolica del Sacro Cuore. Netherlands: Medisch Ethische Toetsingscommissie VUMedisch Centrum, 29/1/2015. Poland: Komisja Bioetycza, Uniwersytetu Jagiellonskiego (122.6120.11.2015), 29/1/2015.Participants provided informed consent in writing, except in the Netherlands and Poland where an informed consent form was not required when questionnaires are filled in anonymously.
: Not applicable.
: The authors declare that they have no competing interests.