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The participants were not different from those did not participate the study on age, sex ratio and other clinical characteristics (data not shown).
Data were recorded using a 275-channel whole-head MEG system (CTF Systems Inc., Port Coquitlam, Canada) at a sampling rate of 600 Hz, from 10 participants all of whom gave their written informed consent to participate (the study conformed with The Code of Ethics of the World Medical Association).
But, unless the local people would be willing to participate, the study would not be done.
Exclusion criteria included 1) 19 years old or younger; 2) patients with possible causes for stabbing headache; and 3) patients who refused to participate the study.
In addition, participants were asked to distribute cards with a link to the web-based version of the questionnaire to their friends on a voluntary basis, inviting them to also participate the study.
In all, 644 children were selected to participate the study.
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104 general practices in the Netherlands participated the study.
Of the 59 PD patients, 47 participated the study.
ZW, BL and SY participated the study.
Informed consent was obtained from every patient participating the study.
DQ, XL, SKP and WMM participated the study.
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