Choi, Hoon Sik
Jang, Hong Seok
Kang, Ki Mun
Choi, Byung-ock
Article History
Received: 12 March 2019
Accepted: 11 June 2019
First Online: 20 June 2019
Ethics approval and consent to participate
: This study was a retrospective study with no informed consent from the individual patient, but was performed according to the relevant guidelines and protocol approved by the intra-institutional ethics committee of the Seoul St. Mary’s hospital (assigned number: KC15RISI0260).
: Not applicable because this analysis has retrospective nature.
: The authors declare that they have no competing interests.