Correction to: Clinical Oral Investigations.

https://doi.org/10.1007/s00784-020-03669-8

After publication of this paper, the authors determined a step sequencing error under “Materials and methods”. Instead of “step 2” and “step 4” the article reads “1”. Under “Compliance with ethical standards” formatting of the sub-heading “Ethical approval” was in need of correction.

The original article has been corrected.