Compliance with Ethical Standards
Funding: No research funds were used for this study.
Conflict of Interest: The authors declare that they have no
conflicts of interest.
Ethical approval: 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: Informed consent was obtained from all
individual participants included in the study.