1. BK21 Plus Program, Department of Senior Healthcare, Graduate SchoolEulji UniversityDaejeon 34824 Korea
2. Materials Characterization Center, Gumi Electronics and Information Technology Research InstituteGumi 39171 Korea
3. Department of DermatologyKorea University College of Medicine, Ansan HospitalAnsan Gyeonggi‐do 15355 Korea
4. Department of Structure and Function of Neural NetworkKorea Brain Research InstituteDaegu 41068 Korea