1. Department of Dermatology; AP-HP; Université Paris VII Sorbonne Paris Cité; and Hôpital Saint Louis; Paris France
2. Department of Haematology; AP-HP; Université Paris VII Sorbonne Paris Cité; and Hôpital Saint Louis; Paris France
3. Department of Haematology; AP-HP; Institut Gustave Roussy; Villejuif France
4. Department of Haematology; AP-HP; Hôpital Necker; Paris France
5. Department of Dermatology; AP-HP; Hôpital Pitié Salpêtrière; Paris France
6. Department of Haematology; AP-HP; Hôpital Pitié Salpêtrière; Paris France
7. Departments of Haematology; AP-HP; Hôpital Avicenne; Bobigny France
8. Department of Haematology; AP-HP; Hôpital Saint Antoine; Paris France