This article is maintained by: Elsevier
Article Title: Observational studies in surgical research
Journal Title: Cirugía Española (English Edition)
CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/J.CIRENG.2021.11.015
CrossRef DOI link to the associated document: https://doi.org/10.1016/J.CIRESP.2021.11.008
Content Type: article
Copyright: © 2021 AEC. Published by Elsevier España, S.L.U. All rights reserved.