Funding for this research was provided by:
Universitas Gadjah Mada (2607/UN1/DITLIT/DIT-LIT/PT/2020)
Received: 16 December 2020
Accepted: 19 May 2021
First Online: 28 May 2021
: This study complied with the Declaration of Helsinki and the Belmont Report. The protocol for this study was approved by the Medical and Health Research Ethics Committee of the Faculty of Medicine, Public Health, and Nursing, Universitas Gadjah Mada (KE/FK/0599/EC/2020). The study was conducted with formal permission from the appropriate hospital officials after explaining the research objectives and procedures. Patients were informed preoperatively of the use of data and tissue samples for research. All patients have consented in written forms.
: Not applicable.
: The authors declare that they have no competing interests.