Updates are available Correction dated 2021-09-03

Article History

Received: 27 November 2019

Accepted: 28 January 2020

First Online: 7 February 2020

Change Date: 3 September 2021

Change Type: Correction

Change Details: A Correction to this paper has been published:

Change Details: https://doi.org/10.1007/s00701-021-04907-y

Compliance with ethical standards

:

: Vasilikos I., Beck J., Grauvogel J., Nisyrios T., Grapatsas K. and Hubbe U. certify that they have no affiliations with or involvement in any organisation or entity with any financial interest (such as honoraria; educational grants; participation in speakers’ bureaus; membership, employment, consultancies, stock ownership, or other equity interest; and expert testimony or patent-licencing arrangements), or non-financial interest (such as personal or professional relationships, affiliations, knowledge or beliefs) in the subject matter or materials discussed in this manuscript.Prof. Ghanaati is a medical consultant in Mectron Inc. that produces the PRF-Centrifugation Device used in our experiments.

: All procedures involving human participants were in accordance with the ethical standards of the institutional (University of Freiburg) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.“This article does not contain any studies with human participants performed by any of the authors.”“All applicable international, national, and institutional guidelines for the care and use of animals were followed.”Due to the in vitro nature of our experiments, there were no violations of the ARRIVE guidelines or Declaration of Helsinki for animal studies. The acquired bovine dura preparations were by-products of the normal commercial meat processing cycle, which complies with the European regulations. The blood used for the PRF preparation was acquired from healthy volunteers. After consultation with the local ethics committee of the University of Freiburg, no formal approval of the study was required.