1. Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Charitéplatz 1; 10117 Berlin Germany
2. Kim Il Sung University, Ryongnam-Dong, Taesong District; Pyongyang DPR Korea