Text and Data Mining valid from 2019-07-12
First Online: 12 July 2019
Compliance with Ethical Standards
: Dr. Xenoudi reports non-financial support from Biohorizons, and personal fees from Millennium Dental Technologies, outside the submitted work.Anastasios Karydis declares no conflicts of interest.
: This article does not contain any studies with human or animal subjects performed by any of the authors.