Dennhardt, Nils https://orcid.org/0000-0003-3831-1608
Sümpelmann, Robert
Horke, Alexander
Keil, Oliver
Nickel, Katja
Heiderich, Sebastian
Boethig, Dietmar
Beck, Christiane E.
Article History
Received: 20 April 2020
Accepted: 7 December 2020
First Online: 18 December 2020
Ethics approval and consent to participate
: This observational study was approved by the local ethics committee (Ethics Committee of Hannover Medical School, Germany, Chairperson Prof. Dr. H. D. Troeger, No. 7349 dated February 2, 2017). The written consent of the parents or guardians was obtained via a treatment contract.
: Not applicable.
: Nothing to declare.