1. Department of Dermatology and Allergology; Academic Teaching Hospital Dresden-Friedrichstadt; Dresden Germany
2. Department of Urology; Academic Teaching Hospital Dresden-Friedrichstadt; Dresden Germany
3. Nirvana Clinic; Vadodara; Gujarat India
4. Policlinic for Dermatology and Venerology; Saint Kliment Ohridski University; University Hospital Lozenetz; Sofia Bulgaria