Physical and mental health of breast cancer patients and survivors before and during successive SARS-CoV-2-infection waves.

"Declarations Conflict of interestThe authors have no financial or personal conflict of interest to disclose. Ethical approvalThis study was in accordance with the ethical standards of the institutional and/ or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consentInformed consent from all individual participants was obtained within UMBRELLA. Originality of the workThis manuscript, including related data, figures and tables, is solely the work of the authors stated, has not been published, and is not under consideration for publication elsewhere. Conflict of interest The authors have no financial or personal conflict of interest to disclose."

"Funding The authors received no financial support for the research (including study design; data collection, analysis, interpretation of data; and writing of the report), authorship, and/ or (the decision to submit the article for) publication."

"The UMBRELLA study adheres to the Dutch Law on Medical Research Involving Human Subjects (WMO) and the Declaration of Helsinki (version 2013). The study was approved by the Medical Research Ethics Committee (MREC) Utrecht (NL52651.041.15, MEC15/165) and is registered on clinicaltrials.gov (NCT02839863)."