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Cirugía Española (English Edition) Validity of a study: Internal and external validity
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Methodological letter
Validity of a study: Internal and external validity
Validez de un estudio: validez interna y externa
Maria Sala Serra
Corresponding author
msalaserra@psmar.cat

Corresponding author.
, Laia Domingo Torrell
Servicio de Epidemiología y Evaluación, Instituto Hospital del Mar de Investigación Médica, Barcelona, Spain
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ISSN: 21735077
Original language: English
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