Article History
First Online: 5 May 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: All authors had full access to the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. All authors have seen and agreed to the submitted version of the manuscript and bear responsibility for it.
: The displayed study was carried out with respect of high ethical standards. All the studies have been approved, when required, by the appropriate ethics committee and have, therefore, been performed in accordance and in conformity to the World Medical Association Declaration of Helsinki (June 1964) and subsequent amendments.
: For this type of study, formal consent is not required.