Appendix A  Supplementary data
The following are the Supplementary data to this article:
Supplementary figure 1 Switzerland map with participating radiation-oncology departments. University Hospitals are marked with a red pinpoint. One university hospital and two satellite centers. Aarau and Baden. Cities in bold refer to radiation oncology departments confronted to COVID-19 patients up to the 7th April, 2020.
Supplementary data 1
Rate of COVID-19 positive patients (Fig. 2A) and estimated reduction of daily activity (Fig 2B) in the Swiss radiation oncology departments on April 7th, 2020.
Supplementary data 2
Total published ASTRO/ESTRO papers on COVID-19 over time versus COVID-19 deaths in Switzerland [13]. In green bars, numbers of survey participants per survey date completion.

Acknowledgements
The authors wish to thank the all the members of the Society of Swiss Radiation Oncologists (SRO) and the Scientific Association of Swiss Radiation Oncology (SASRO) for their contribution to this work.
All data generated and analyzed during this study are included in this published article. ☆  The Editors of the Journal, the Publisher and the European Society for Radiotherapy and Oncology (ESTRO) cannot take responsibility for the statements or opinions expressed by the authors of these articles. Practitioners and researchers must always rely on their own experience and knowledge in evaluating and using any information, methods, compounds or experiments described herein. Because of rapid advances in the medical sciences, in particular, independent verification of diagnoses and drug dosages should be made. For more information see the editorial “Radiotherapy & Oncology during the COVID-19 pandemic”, Vol. 146, 2020.
Appendix A  Supplementary data to this article can be found online at https://doi.org/10.1016/j.radonc.2020.05.047.