Received: 27 September 2019
Accepted: 21 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: The study was approved by the Bambino Gesù Children’s Hospital Scientific Board (Rome, Italy); at the time of each recording parents signed an informed consent. All procedures performed in this study 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.
: Not applicable.
: The authors declare that they have no competing interests.