Text and Data Mining valid from 2019-05-11
Received: 21 October 2018
Accepted: 30 April 2019
First Online: 11 May 2019
Compliance with ethical standards
: The clinical research in this study was approved by the Ethics Committee of The First Affiliated Hospital of Shantou University Medical College and conformed to the guidelines of Helsinki Declaration.
: All samples were collected after obtaining the informed consent form signed by all the subjects.