Received: 30 April 2020
Accepted: 13 July 2020
First Online: 22 July 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of China Medical University & Hospital Research Ethics Center [CTU103–1/CMUH103-REC1–088], and it adhered to the principles of the Declaration of Helsinki. Because the data were analyzed anonymously, the ethical committee waived the need for written consent.
: Data was obtained from NHI research database after ethics committee approval. No direct patient contact including consent took place.
: The authors declare that they have no competing interests.