1 Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA. Electronic address: polosil1@mskcc.org.
2 Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
3 Dermatology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York, USA; Department of Dermatology, Chelsea and Westminster Hospital, London, United Kingdom.
4 Skagit Regional Health, Mount Vernon, Washington, USA.
5 Department of Epidemiology and Biostatistics, Memorial Sloan Kettering Cancer Center, New York, New York, USA.