Text and Data Mining valid from 2020-01-13
Received: 23 October 2019
Accepted: 5 January 2020
First Online: 13 January 2020
Compliance to Ethical Standards
: The authors declare that they have no conflict of interest.
: The study on which this letter refers to was approved by the local human research ethics committee, and all procedures performed 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.
: Informed consent was obtained from all individual participants included in the abovementioned study.
: Consent for Publication was obtained for every individual person's data included in the abovementioned study.