Funding for this research was provided by:
Suzhou Key Medical Center (Szzxj201506)
guiding research subject of Changzhou Municipal Health Bureau (WZ201702)
Received: 14 July 2018
Accepted: 25 September 2018
First Online: 29 October 2018
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Soochow University. All patients and their family members signed the informed consent form.
: Not applicable.
: The authors declare that they have no competing interest.