1. University Hospital Zürich Skin Cancer Center, Zürich, Switzerland
2. Istituto Nazionale Tumori IRCCS Fondazione “G. Pascale,” Naples, Italy
3. Mount Vernon Cancer Centre, Northwood, United Kingdom
4. Gustave Roussy and Paris-Sud-Paris-Saclay University, Villejuif, France
5. University Hospital Essen, Essen, Germany, and German Cancer Consortium, Heidelberg, Germany