Wang, Sheng-jun
Yan, Chuan-zhu
Liu, Yi-ming
Zhao, Yu-ying
Funding for this research was provided by:
Natural Science Foundation of Shandong Province, China (No.ZR2017MH082)
Innovative Research Project of Resident Standardization Training of Qilu Hospital, Shandong University (No.ZPZX2017B10)
Article History
Received: 26 October 2017
Accepted: 17 January 2018
First Online: 26 January 2018
Compliance with ethical standards
:
: The authors report no disclosures relevant to the manuscript. There are no conflicts of interest in this manuscript.