Text and Data Mining valid from 2019-05-22
Received: 6 December 2018
Accepted: 10 May 2019
First Online: 22 May 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand. Written informed consent were obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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