Text and Data Mining valid from 2018-10-03
Received: 25 April 2018
Accepted: 25 September 2018
First Online: 3 October 2018
Ethics approval and consent to participate
: The study protocol was reviewed and approved by ethical review committees of Peking University Health Science Centre (no. IRB00001052–15059). All of the participants in the CUADHS provided written consent for participation.
: Not applicable.
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