Further study in aetiology of carcinomas of the upper alimentary tract.
D002277:Carcinoma; D004938:Esophageal Neoplasms; D006801:Humans; D009062:Mouth Neoplasms; D010610:Pharyngeal Neoplasms
ESOPHAGEAL NEOPLASMS; MOUTH NEOPLASMS; PHARYNGEAL NEOPLASMS