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Article History

Received: 1 February 2021

Revised: 25 May 2021

Accepted: 2 June 2021

First Online: 22 June 2021

Declarations

:

: The scientific guarantor of this publication is Dr. Xavier Castells.

: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.

: Two of the authors, Dr. Marta Román and Msc. Javier Louro, have significant statistical expertise. They are at the Department of Epidemiology and Evaluation, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain.

: Written informed consent was waived by the review boards because we used anonymized retrospective data.

: Institutional review board approval of each participating institution (Asturias, Costa de Ponent, Vallés Oriental, Sabadell-Cerdanyola, Barcelona-Àrea Metropolitana Sud, Cantabria, Hospital de la Santa Creu i Sant Pau, Girona, Tarragona and Hospital Clínic i Provincial de Barcelona) was obtained.

: Some study subjects or cohorts have been reported in a previous study [Castells X, et al. (2015) Breast cancer, Res Treat 149: 237–244], which included 6011 of 17,831 women evaluated in the current study.

: • retrospective• observational• multicenter study