Longondjo Etambakonga, Clément
Roloff, Julia
Article History
Received: 4 September 2018
Accepted: 30 October 2019
First Online: 4 December 2019
Compliance with Ethical Standards
:
: The author declares that he has 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.
: Informed consent was obtained from all individual participants included in the study.