Received: 10 June 2019
Accepted: 13 September 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: This study complied with the standards of the Declaration of Helsinki and current ethical guidelines. It was approved by the Sun Yat-sen University Cancer Center research ethics committee. All patients provided written informed consent for the collection and publication of their medical information at the first visit to our center, which was filed in their medical records.
: Not applicable.
: The authors declare that they have no conflict of interest.