1. Departments of Dermatology, Venereology, Allergology and Immunology, Dessau Medical Center, Theodore Fontane Medical University of Brandenburg, Dessau, Germany
2. Department of Dermatology, Andreas Sygros Hospital, National and Kapodistrian University of Athens, Athens, Greece
3. Department of Venerology and Dermatology, Otto von Guericke University Magdeburg, Magdeburg, Germany