- Correspondence to Jewell Johnson, Philadelphia Department of Public Health, Philadelphia, PA 19107, USA;
- Received August 18, 2020
- Revised November 2, 2020
- Accepted November 13, 2020
- First published February 3, 2021.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.