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Article History

Received: 20 December 2018

Accepted: 26 July 2019

First Online: 6 August 2019

Ethics approval and consent to participate

: Ethical approvals were granted by the Human Subjects Ethics Sub-Committee at The Hong Kong Polytechnic University, Hong Kong (Reference Number: HSEARS20170911003); The Affiliated Hospital of Southwest Medical University, China (Reference Number: KY2017008); The Affiliated Hospital of North Sichuan Medical College, China (Reference Number: 2018 ER (R)010); and The Fifth Affiliated Hospital of Zunyi Medical University, China (Reference Number: [2017] K21). Written informed consent was required from each of the study participant.

: Not applicable.

: The authors declare that there is no any conflict of interests regarding the publication of this paper.