Received: 15 April 2019
Accepted: 10 July 2019
First Online: 30 July 2019
Ethics approval and consent to participate
: Approval for the research was obtained by the local ethics committees (Comitato Etico Interaziendale, Novara, Italy, protocol UNI-ORTO, no. 1/2014; University of Silesia in Katowice Human Research Ethics Committee, no. 14/2015; Spain Comité Ético de Investigación en Humanos de la Universitat de València, no. H1409824786250). All procedures performed in the study were in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki). Participation was anonymous and informed written consent was obtained from participants. No fee or reimbursement was offered for participation in the study.
: Not applicable.
: Carla Maria Gramaglia currently acts as an Editorial Board member for BMC Psychiatry. All other authors declare that they have no competing interests.