[1] Univ Med Ctr, Ctr Chron Pruritus KCP, Munster, Germany
[2] Univ Med Ctr, Dept Dermatol, Munster, Germany
[3] Univ Med Ctr Hamburg Eppendorf, Inst Hlth Care Res Dermatol & Nursing IVDP, Competence Ctr Nursing Res Dermatol CVderm, Hamburg, Germany
[4] Charite Univ Med Ctr, Inst Gen Med, Berlin, Germany
[5] Univ Erlangen Nurnberg, Dept Med Gastroenterol Pulmonol & Endocrinol 1, Erlangen, Germany
[6] Graz Med Univ, Dept Dermatol, Venereol, Graz, Austria
[7] Univ Munster, Fac Med, Ctr Gen Med, Munster, Germany
[8] DKD Helios Klin, Dept Nephrol, Wiesbaden, Germany
[9] Charite Univ Med Ctr, Dept Dermatol Venereol & Allergol, Allergy Ctr Charite, Berlin, Germany
[10] Charite Univ Med Ctr, DEBM, Dept Dermatol Venereol & Allergol, Berlin, Germany
[11] Univ Med Ctr Giessen & Marburg, Dept Dermatol Venereol & Allergol, Giessen Site, Giessen, Germany
[12] Carl von Ossietzky Univ Oldenburg, Klinikum Oldenburg AoR, Dept Dermatol & Allergol, Fac Med & Hlth Sci, Oldenburg, Germany
[13] Univ Med Cener, Dept Psychosomat Med & Psychotherapy, Munster, Germany
[14] Paulinenkrankenhaus Bad Bentheim, Dermatol Bad Bentheim, Dermatol Practice, Dortmund, Germany
[15] Med Ctr Dortmund gGmbH, Dept Dermatol, Dortmund, Germany
[16] Univ Med Ctr, Dept Dermatol, Clin Res Ctr, Mainz, Germany
[17] Aarau Canton Hosp, Dept Dermatol, Aarau, Switzerland
[18] Univ Med Ctr, Dept Clin Social Med Occupat & Environm Dermatol, Heidelberg, Germany