Received: 6 September 2019
Accepted: 31 January 2020
First Online: 18 February 2020
Ethics approval and consent to participate
: The institutional review board in the First Affiliated Hospital of Nanjing Medical University has approved the trial (protocol reference: 2019-SR-360). Any important changes regarding the study protocol in terms of eligibility criteria, interventions, outcomes or analyses will be conducted under the supervision and approval of the institutional review board. The written informed consent form will be collected from each participant as required by the ethics committee and in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.