[The incidence of periodontal diseases among students aged 14-19 in the district of Blagoevgrad].
D003753:Dental Health Surveys; D003813:Dentistry; D010510:Periodontal Diseases / Q000453:epidemiology
Razprostranenie na parodontopatite vsred uchenitsi ot 14. do 19-god. Vŭzrast v blagoevgradski okrŭg.