Text and Data Mining valid from 2018-07-09
First Online: 9 July 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Twenty-three patients were enrolled prospectively after both oral and written information and signed consent. Six patients were enrolled retrospectively, with previously obtained formal consent to retroactive use of tissue still valid.