[1] Mayo Clin, Dept Dermatol, 200 First St SW, Rochester, MN 55905 USA
[2] Mayo Clin Hosp, Dept Anesthesiol & Perioperat Med, Phoenix, AZ USA
[3] Aarhus Univ Hosp, Dept Dermato Venereol, Aarhus C, Denmark
[4] Mayo Clin, Dept Dermatol, Scottsdale, AZ USA