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Article History

Received: 28 June 2018

Accepted: 29 April 2019

First Online: 8 May 2019

Ethical approval and consent to participant

: 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 study was approved by the Institutional reviewing board of Huashan hospital Fudan University (2008–071). Each participant had signed an informed consent for the clinical data collection and genetic screening. For the participants who were under 18 years old when admitted into the study, the informed consent was signed by the biological parents. The article does not contain any studies with animals performed by any of the authors.

: All the participants gave consent for publication of the potentially identifying information including sex, gender, age and genetic screening results in the journal of BMC Neurology.

: The authors declare that they have no competing financial or non-financial interests.

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