Received: 9 August 2019
Accepted: 21 November 2019
First Online: 29 November 2019
Ethics approval and consent to participate
: Written informed consent was obtained from each woman at admission, for newborns by both parents after delivery. The study was approved by the Mother and Child Department of the University of Palermo (Palermo, Italy). All procedures performed in this study 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.