506 Ann Dermatol Received May 27, 2016, Revised August 5, 2016, Accepted for publication August 11, 2016 Corresponding author: Sung Ku Ahn, Department of Dermatology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju 26426, Korea. Tel: 82-33-741-0621, Fax: 82-33-748-2650, E-mail: [email protected] This is an Open Access article distributed under the terms of the Creative Commons ...