Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (GRK2274)
Received: 14 May 2019
Accepted: 30 July 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This study is based on retrospective and anonymized data, which was acquired for routine clinical dosimetry (Ethics Committee of LMU Munich).
: Not applicable.
: The authors declare that they have no competing interests.