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JM Jesse Mu
KC Kallol R. Chaudhuri
CB Concha Bielza
JP Jesus de Pedro-Cuesta
PL Pedro Larrañaga
PM Pablo Martinez-Martin
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PD patients diagnosed according to internationally recognized criteria (Gibb and Lees, 1988; Lees et al., 2009) were included, and represented a mixed cohort of drug-naïve and treated PD across all disease stages. For the NMSS study, patients were older than 30 years, but for inclusion of NILS patients there was no age limit. Exclusion criteria were: inability to read, understand, or answer written questionnaires; comorbidity, sequelae, or any disorder interfering with the assessment of PD; and inability to give informed consent. Patient recruitment was carried out across 15 countries in America, Asia, and Europe from 2007 to 2011.

Copyright and License information:  ©2017 Mu, Chaudhuri, Bielza, de Pedro-Cuesta, Larrañaga and Martinez-Martin.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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