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Cytological screening and 15 years’ follow-up (1986–2001) for early esophageal squamous cell carcinoma and precancerous lesions in a high-risk population in Anyang County, Henan Province, Northern China

Cytological ScreeningEsophagusCancer EpidemiologyEsophageal CancerCancer RiskMedicineEpidemiology Of CancerPathologyAnyang CountyOncologyRadiation OncologyHenan ProvinceCancer Research