ARTÍCULO ESPECIAL
Estudios epidemiológicos: tipos, diseño e interpretación
Epidemiological studies: Types, design and analysis
V. Hernández
Servicio de Aparato Digestivo, Hospital Álvaro Cunqueiro, Instituto de Investigación Sanitaria Galicia Sur, Estrutura Organizativa de Xestión Integrada de Vigo, Vigo, España
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