Received: 15 February 2019
Accepted: 16 May 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: Medical Ethical Committee of Nanfang Hospital of Southern Medical University has approved the Research ethics approval. All included patients consented to participate in this study and a signed consent form was obtained from each subject before testing. All procedures were conducted according to the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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