Funding for this research was provided by:
Qualcomm® Wireless Reach™
Received: 14 August 2017
Accepted: 3 April 2018
First Online: 17 April 2018
Ethics approval and consent to participate
: Ethical approval was given by the medical ethics committee of Peking University Institutional Review Board (PU IRB) with the following reference number IRB00001052–16010-Exempt. The informed consent to participate in the study has been obtained from participants.
: The authors declare that they have no competing interests.
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