Funding for this research was provided by:
China Medical Board (13-134)
Text and Data Mining valid from 2018-10-11
Received: 18 June 2017
Accepted: 27 September 2018
First Online: 11 October 2018
Ethics approval and consent to participate
: The study was approved by Ethics Committee of Wuhan University School of Medicine. Researchers obtained informed consent of each trainee prior to the evaluation.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.