Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
역학은 질병의 발생과 분포를 연구하는 학문입니다.yeokhageun jilbyeong-ui balseong-gwa bunpureul yeonguhaneun hakmunimnida.Epidemiology is the study of the occurrence and distribution of diseases.