1. Liang, W. et al. Lancet Oncol. 21, 335–337 (2020).
2. Wu, Z. & McGoogan, J. M. JAMA 323, 1239–1242 (2020).
3. Onder, G., Rezza, G. & Brusaferro, S. JAMA 323, 1775–1776 (2020).
4. Centers for Medicare & Medicaid Services. https://www.cms.gov/files/document/cms-non-emergent-elective-medical-recommendations.pdf (2020).
5. Cancer Research UK. https://www.cancerresearchuk.org/sites/default/files/april2020_cruk_hsc_submission_covid_cancer_final_public.pdf (2020).