Methodological letter
Observational studies in surgical research
El estudio observacional en investigaciones quirúrgicas
Gianluca Pellinoa,b, Ewen M. Harrisonc, Sebastiano Biondod, Eloy Espín-Basanya,
Corresponding author
a Unidad de Cirugía Colorrectal, Servicio de Cirugía General, Hospital Universitario Valle de Hebrón, Barcelona, Spain
b Department of Advanced Medical and Surgical Sciences, Università degli Studi della Campania «Luigi Vanvitelli», Naples, Italy
c Centre for Medical Informatics, Usher Institute, University of Edinburgh, Edimburgo, United Kingdom
d Servicio de Cirugía General, Hospital Universitario Bellvitge, Barcelona, Spain
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