Received: 3 November 2019
Accepted: 29 January 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: This protocol was approved by the Clinical Research and Bioethics Committee at Reina Sofía University Hospital, Córdoba (Spain), conforming to the fundamental ethical principles laid down in the Declaration of Helsinki. Informed written consent was obtained from the parents or legal guardians of each participant before testing.
: Not applicable.
: The authors declare that they have no competing interests.