Relationships between socioeconomic status, gingival health and oral hygiene in schoolchildren.
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D002648:Child; D005260:Female; D005882:Gingival Diseases / Q000453:epidemiology*; D006801:Humans; D008297:Male; D008404:Massachusetts / Q000453:epidemiology; D009911:Oral Hygiene Index; D010512:Periodontal Index; D012923:Social Class