1. Group Practice for Dermatology, Allergology, Phlebology; and Laser Medicine Dr. Dorittke and Dr. Kardorff; Mönchengladbach Germany
2. Practice for Dermatology; Allergology, and Phlebology; Korschenbroich Germany
3. Clinic and Polyclinic for Dermatology and Allergology Biederstein; Technical University of Munich; Germany