Epidemiological principles in studying periodontal diseases.
Beck
J D
JD
Department of Dental Ecology, University of North Carolina, Chapel Hill, USA.
Löe
H
H
D003625:Data Collection; D018865:Dental Research / Q000379:methods*; D018450:Disease Progression; D004812:Epidemiologic Methods; D006801:Humans; D015994:Incidence; D010510:Periodontal Diseases / Q000175:diagnosis / Q000453:epidemiology*; D010512:Periodontal Index; D015995:Prevalence; D015203:Reproducibility of Results; D012107:Research Design