Received: 16 April 2021
Accepted: 20 May 2021
First Online: 16 June 2021
: Written informed consent was obtained from parents of the first patient, and from the second patient. The study was approved by the Mother and Child Department of the University of Palermo (Palermo, Italy). All procedures performed in this report were in accordance with the ethical standards of the institutional and 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.