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2. Tooth retention and tooth loss in the permanent dentition of adults: United States, 1988–1991;Marcus;J Dent Res,1996
3. Missing teeth and lost teeth of adults aged 30 years and over in south-western Finland;Hiidenkari;Community Dent Health,1996
4. The frequency of periodontal extractions in Finland;Ainamo;Community Dent Health,1984
5. The reasons underlying the extraction of teeth in Scotland;Kay;Br Dent J,1986