Editor's response to the letter "Retrospective cohort study of maternal outcomes by placenta praevia type: limitations of external and internal validity of the results"
DOI:
https://doi.org/10.18597/rcog.4124Author Biography
Hernando Gaitán-Duarte, Revista Colombiana de Obstetricia y Ginecología (RCOG), Bogotá (Colombia).
Revista Colombiana de Obstetricia y Ginecología (RCOG), Bogotá (Colombia).
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Olsen C, George D. Cross-Sectional Study Design and Data Analysis [Internet]. Young Epidemiology Scholars Program (YES). http://yes-competition.org/media.collegeboard.com/digitalServices/pdf/yes/4297_MODULE_05.pdf.
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