[1] Univ Copenhagen, Herlev & Gentofte Hosp, Dept Dermatol & Allergy, Hellerup, Denmark
[2] Univ Copenhagen, Rigshosp, Dept Ophthalmol, Copenhagen, Denmark
[3] Univ Copenhagen, Rigshosp, Dept Pathol, Copenhagen, Denmark
[4] Karolinska Inst, Dept Clin Neurosci, Div Ophthalmol & Vis, Stockholm, Sweden
[5] Univ Helsinki, Dept Skin & Allerg Dis, Cent Hosp, Helsinki, Finland
[6] Univ Helsinki, Dept Dermatol, Cent Hosp, Helsinki, Finland
[7] Bispebjerg Hosp, Dept Dermatol, Copenhagen, Denmark
[8] Univ Med Ctr Utrecht, Dept Dermatol Allergol, Utrecht, Netherlands
[9] Hudpoliklinikken, Namsos, Norway
[10] Tampere Univ Hosp, Dept Dermatol, Tampere, Finland
[11] Karolinska Univ Hosp, Dept Med, Dermatol & Venereol Unit, Stockholm, Sweden
[12] Kainuu Cent Hosp, Dept Dermatol, Kajaani, Finland
[13] Hallandskustens Hudmottagning, Kungsbacka, Sweden
[14] Nordland Hosp, Dept Dermatol, Bodo, Norway
[15] Oslo Univ Hosp, Dept Pathol, Oslo, Norway
[16] Aarhus Univ Hosp, Dept Dermatol & Venereol, Aarhus, Denmark
[17] Lund Univ, Dept Dermatol, Skane Univ Hosp, Malmo, Sweden
[18] Lund Univ, Clin Res Ctr, Malmo, Sweden