Chih, Hui Jun
Liang, Wenbin
Article History
Received: 8 March 2017
Accepted: 23 August 2017
First Online: 2 September 2017
Ethics approval and consent to participate
: The study was approved by Research Ethics Review Board of the United States NCHS, an institutional ethics committee (Protocol # 2009–16) [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.
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