Received: 13 November 2018
Accepted: 8 May 2019
First Online: 7 June 2019
Ethics approval and consent to participate
: All procedures performed 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. The Ethics Committee of the IRCCS Centro Neurolesi Bonino Pulejo (Messina, Italy) approved the study (IRCCSME_32/17).<b>Informed consent</b>Written informed consent was obtained from all individual participants included in the study. None of the patients with PD experienced cognitive problems.
: Not applicable.
: The authors declare that they have no competing interests.
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