Funding for this research was provided by:
National Natural Science Foundation of China (81102113))
Natural Science Foundation of Heilongjiang Province (H2015012)
Received: 7 December 2017
Accepted: 16 March 2018
First Online: 27 March 2018
Ethics approval and consent to participate
: We carried out this study after obtaining informed written consent from study subjects and approval from the Human Research and Ethics Committee of Harbin Medical University. Informed consents were obtained from all individual participants included in the study. Participates’ under 16 years old informed consents were obtained from their parents or legal guardians.
: Not applicable.
: The authors declare that they have no competing interest.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.