1. Department of Chemical and Product Safety German Federal Institute for Risk Assessment (BfR) Berlin Germany
2. Department of Environment and Health Istituto Superiore di Sanità (ISS) Rome Italy
3. Department of Dermatology University of Regensburg Regensburg Germany
4. European Commission, DG Internal Market Industry, Entrepreneurship and SMEs (GROW) Brussels Belgium
5. Institute of Inorganic and Analytical Chemistry University of Münster Münster Germany
6. National Centre for Chemicals Cosmetic Products and Consumer's Health Protection ‐ Istituto Superiore di Sanità (ISS) Rome Italy
7. Environment and Lifestyle Epidemiology Branch International Agency for Research on Cancer (IARC) Lyon France
8. Karlsruhe Chemical and Veterinary Investigation Authority Karlsruhe Germany
9. CTL GmbH Bielefeld Bielefeld Germany
10. Kanton Basel‐Stadt, Kantonales Laboratorium Basel Switzerland
11. Department of Metrology and Optoelectronics, Faculty of Electronics, Telecommunication, and Informatics Gdansk University of Technology Gdansk Poland
12. Office of Cosmetics and Colors United States Food and Drug Administration (FDA) College Park Maryland USA
13. Department of Dermatology Helsinki University Hospital and University of Helsinki Helsinki Finland
14. “Tattoo Consultation”, Department of Dermatology Bichat – Claude Bernard Hospital Paris France
15. EADV Tattoo and Body Art Task Force Lugano Switzerland
16. Department of Dermatology, the Tattoo Clinic Bispebjerg University Hospital Copenhagen Denmark
17. Information Network of Departments of Dermatology – IVDK Institute at the University Medical Center Göttingen Göttingen Germany
18. Tattoo Clinic (Tattoo Poli), Department of Dermatology Alrijne Hospital Leiden CK The Netherlands