Nikolaev, Vasily V. http://orcid.org/0000-0001-7815-4825
Article History
Accepted: 29 July 2019
First Online: 6 August 2019
Compliance with ethical standards
:
: The study complied with principles of the declaration of Helsinki (1964), and received approval from the institutional Ethical and Clinical Research Committee (2010).
: Parents of patients gave informed consent to the work.