1)Peng, X., Xu, X., Li, Y. et al. Transmission routes of 2019-nCoV and controls in dental practice. Int J Oral Sci 12, 9 (2020). https://doi.org/10.1038/s41368-020-0075-9
2)Coronavirus Frequently Asked Questions, ADA center for professional success (American Dental Association) Mar 27, (2020) https://success.ada.org/en/practice-management/patients/coronavirus-frequently-asked-questions