1 Department of Dermatology, University of Colorado School of Medicine, Aurora, Colorado.
2 Ottawa Hospital Research Institute, Ottawa, Ontario, Canada.
3 Department of Dermatology, Brown University, Providence, Rhode Island.
4 Department of Dermatology, Naval Medical Center, San Diego, California.
5 University of Nottingham, University of Nottingham Libraries, Nottingham.
6 Dermatology Service, US Department of Veterans Affairs Rocky Mountain Regional Medical Center, Aurora, Colorado. Electronic address: Robert.dellavalle@ucdenver.edu.