Text and Data Mining valid from 2019-04-23
Received: 4 December 2018
Accepted: 12 April 2019
First Online: 23 April 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethical Committee of Shandong Provincial Hospital Affiliated to Shandong University (Approval No. 2018–215), which met the criteria of the Helsinki accord for experimentation of pain in human subjects. All participants gave their written and informed consent prior to the test.
: Not applicable.
: The authors declare that they have no completing interests.
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