Received April 23, 2014, Revised June 25, 2014, Accepted for publication June 30, 2014 *These authors contributed equally to this study. Corresponding author: Beom Joon Kim, Department of Dermatology, Chung-Ang University Hospital, 102 Heukseok-ro, Dongjak-gu, Seoul 06973, Korea. Tel: 82-2-6299-1525, Fax: 82-2-823-1049, Email: [email protected] This is an Open Access article distributed und...