Funding for this research was provided by:
Shantou University Medical College Clinical Research Enhancement Initiative (201407)
the Shantou City Science and Technology Plan Major Project, Guangdong Province, China (20140305)
Text and Data Mining valid from 2018-07-09
Received: 29 November 2017
Accepted: 14 June 2018
First Online: 9 July 2018
Compliance with ethical standards
: This study was approved by the Ethics Committee of our institution. All patients signed informed consent.
: The authors declare that they have no conflict of interest.
: This study was approved by the Ethics Committee of the Second Affiliated Hospital, Shantou University Medical College. All patients signed informed consent.