[Merits or demerits of cytodiagnosis and biopsy in the diagnosis of early stomach cancer].
D001706:Biopsy; D003581:Cytodiagnosis; D005336:Fiber Optic Technology; D005773:Gastroscopy; D006801:Humans; D013274:Stomach Neoplasms / Q000175:diagnosis*; D013997:Time Factors