1. Statistics Korea. Statistics of the elderly [Internet]. Daejeon: Statistics Korea; 2014 [cited 2014 Sep 19]. Available from: https://kostat.go.kr/portal/korea/kor_nw/1/1/index.board?bmode=read&bSeq=201&aSeq=330349&pageNo=1&rowNum=10&navCount=10&currPg=&searchInfo=srch&sTarget=title&sTxt=%EA%B3%A0%EB%A0%B9%EC%9E%90%ED%86%B5%EA%B3%84.
2. International Diabetes Federation. IDF diabetes atlas [Internet]. Brussels: International Diabetes Federation; 2015 [cited 2017 Jul 17]. Available from: http://www.idf.org/diabetesatlas.
3. Korea Disease Control and Prevention Agency. Health behavior and chronic disease statistics: Korea national health and nutrition examination survey·Youth health behavior online survey 2019 [Internet]. Cheongju: Korea Disease Control and Prevention Agency; 2019 [cited 2017 Jun 20]. Available from: https://knhanes.kdca.go.kr/knhanes/main.do.
4. Global aetiology and epidemiology of type 2 diabetes mellitus and its complications
5. Diabetic retinopathy