2.2. Ethical Statement
The purpose and requirements of this study were explained to the participants in detail. Patients could withdraw their consent to participate in the study at any time during the experimental procedure. Written informed consent was obtained from all patients. This study was approved by the Sahmyook University Institutional Review Board (approval number: 2-7001793-AB-N-012019064HR) and the Clinical Research Information Service (KCT0005823). Participants’ rights were protected according to the ethical principles of the Declaration of Helsinki. 