Received: 29 January 2020
Accepted: 11 May 2020
First Online: 25 May 2020
Ethics approval and consent to participate
: The study was approved by the Medical Ethical Committee of the State Chamber of Medicine of Rhineland Palatinate in Mainz, Germany (reference number 837.374.14).
: The patients or their parents/guardians gave a written consent to publication of their anonymized clinical data.
: All authors declare that they have no competing interests.