Funding for this research was provided by:
National Natural Science Foundation of China (81501932)
China Postdoctoral Science Foundation (2015M570440)
Natural Science Foundation of Jiangsu Province (BK20150107)
Received: 23 July 2017
Accepted: 24 July 2018
First Online: 2 August 2018
Ethics approval and consent to participate
: The Ethics Committee of the Affiliated Drum Tower Hospital of Nanjing University Medical School approved the study protocol. Written informed consent was obtained from all patients enrolled in the investigation. For the minors, written consent to participate was given by their parents on their behalf.
: Not applicable.
: Zezhang Zhu is a member of the Editorial Board of BMC Musculoskeletal Disorder. The other authors declare that they have no competing interests.
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