Statistical appraisal of the association of smoking and chewing habits to oral and pharyngeal cancers.
D006801:Humans; D007194:India; D009062:Mouth Neoplasms / Q000453:epidemiology / Q000209:etiology*; D010610:Pharyngeal Neoplasms / Q000453:epidemiology / Q000209:etiology*; D010947:Plants, Toxic; D012907:Smoking / Q000150:complications*; D014026:Nicotiana