Received: 26 February 2019
Accepted: 2 April 2020
First Online: 17 April 2020
Ethics approval and consent to participate
: The study was approved by the regional Research Ethics Committee (Lund, registration number 2016/289), and written consent from both parents was obtained for all patients.
: All participants consented to publication of the study.
: The authors declare that they have no competing interests.