1. Department of Dermatology Brest University Hospital Brest France
2. Department of Biochemistry and Pharmaco‐Toxicology Brest University Hospital Brest France
3. Univ BrestLIEN Brest France
4. EA 7449 REPERES (Pharmacoepidemiology and Health Services Research) Rennes 1 University Rennes France
5. Department of Dermatology Rennes University Hospital Rennes France
6. Department of Haematology Brest University Hospital Brest France