Pindborg, J J Epidemiological studies of oral cancer. [electronic resource] - International dental journal Jun 1977 - 172-8 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0020-6539 Subjects--Topical Terms: CzechoslovakiaEpidemiologyFemaleGermany, EastHumansIndiaLeukoplakia, Oral--epidemiologyLip Neoplasms--epidemiologyMaleMouth Neoplasms--epidemiologyNorwaySex FactorsTongue Neoplasms--epidemiology