Article History
Received: 23 February 2018
Accepted: 20 June 2018
First Online: 25 June 2018
Ethics approval and consent to participate
: The study was conducted according to the principles of the Declaration of Helsinki and approved by the China-Japan Friendship Hospital on Human Health Ethic Committee. Participation to the study was voluntary and written informed consent was obtained from each participant. We have received permission from the local hospital management to access patient medical records.
: Not applicable.
: The authors declare that they have no competing interests.
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