1. Dermatology and Laser Center; Landau Germany
2. Universität Osnabrück, Kosmetologie und Gesundheitswissenschaften Department (Leiter Prof. Dr John); Osnabrück Germany
3. Veterinary Research Institute; Brno Czech Republic
4. Dermatology Department; University Carol Davila; Bucharest Romania
5. Dermatology and Venereology; University Hospital Motol; Prague Czech Republic