R Villaseñor Caloca

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Esophageal cancer is a pathology with a remarkable geographical variety, considered to be a disease of the poor. The common incidence reported in western countries of 3 per 100,000 per year, contrasts with 140 per 100,000 reported in Central Asia in an area that is known as the "esophageal cancer belt". Among a wide spectrum of potential etiologic agents,(More)
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