[1] Mayo Clin, Alix Sch Med, Rochester, MN USA
[2] Johns Hopkins Bayview Med Ctr, Baltimore, MD 21224 USA
[3] Mayo Clin, Dept Dermatol, Rochester, MN USA
[4] Mayo Clin, Div Prevent Occupat & Aerosp Med, Dept Internal Med, Rochester, MN USA
[5] Mayo Clin, Div Hematol, Dept Internal Med, Rochester, MN USA
[6] Epiphany Dermatol, Dallas, TX USA