[1] Sahlgrens Univ Hosp, Dept Dermatovenereol, SE-41345 Gothenburg, Sweden
[2] Sodra Alvsborgs Hosp, Dept Dermatovenereol, Boras, Sweden
[3] Univ Gothenburg, Dept Rheumatol & Inflammat Res, Gothenburg, Sweden
[4] Univ Gothenburg, Dept Psychiat & Neurochem, Gothenburg, Sweden