Funding for this research was provided by:
Directorate-General for Employment, Social Affairs and Inclusion (Project No. QLK4-2002-02650)
Article History
Received: 29 June 2018
Accepted: 25 September 2018
First Online: 1 October 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.