Article History
First Online: 8 February 2018
Compliance with Ethical Standards
:
: The authors have no conflicts of interest relevant to this article to disclose.
: 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. The University of London research governance ensured covering of ethical requirements.
: Informed consent was obtained from all individual participants included in the study.