- Correspondence to Dr Margaret Sällberg Chen, Department of Dental Medicine, Karolinska Institutet, Huddinge 14141, Sweden;
- Received August 23, 2018
- Revised February 25, 2019
- Accepted February 25, 2019
- First published March 14, 2019.
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.