Funding for this research was provided by:
Research grant of the Department of Dermatology of the University Hospital Zurich
Received: 15 July 2019
Accepted: 21 September 2019
First Online: 11 October 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee Zurich (Protocol No. 2011-0203). All patients gave oral and written informed consent for the routine diagnostic procedures of which the results were analysed in this study. In addition, a general consent was signed by each patient allowing anonymous analysis of the study data.
: Not applicable.
: PSG has received lecture honoraria from Thermo Fisher Scientific and consulting fees from ALK-Abello. The rest of the authors declare that they have no competing interests.