Funding for this research was provided by:
Universitas Gadjah Mada (UPPM/223/M/05/04/05.17)
Received: 2 January 2020
Accepted: 10 March 2020
First Online: 18 March 2020
Ethics approval and consent to participate
: This study was carried out in accordance with the Belmont Report and the Declaration of Helsinki. The study protocol was reviewed and approved by the Medical and Health Research Ethics Committee of Faculty of Medicine, Public Health, and Nursing, Universitas Gadjah Mada (KE/FK/0759/EC/2019). The research objectives and procedure were clearly explained to the hospital research administrators. Officials from both hospitals gave permission to conduct this study. The patients were preoperatively informed and had consented to the usage of the tissue samples for research purposes.
: Not applicable.
: The authors declare that they have no competing interests.