Consent to participate in the study was permitted to be determined autonomously without outside pressure, and research subjects were asked to submit a written consent form in order to engage in the study, while those who did not were disqualified from participating.
연구 참여 동의여부는 외부압력이 없이 자율적인 의지로 결정 할 수 있도록 하였고 연구대상자는 사전 동의서를 제출하도록 하며 미 제출자는 연구대상에서 제외시켰다.