Text and Data Mining valid from 2019-05-11
Received: 24 January 2019
Accepted: 2 May 2019
First Online: 11 May 2019
Compliance with ethical standards
: All children were included only after informed written consent was obtained from their parents or guardians. The study protocol was approved by the Institutional Research Ethics Committee and the Ethics Committee of the “Aghia Sophia” Children’s Hospital. The procedures followed were according to institutional guidelines and the Declaration of Helsinki.
: The authors declare that they have no conflict interest.