1. Department of Dermatology, School of Medicine, Bio-Medical Research Institute, Kyungpook National University, Daegu, Korea.
2. Department of Mathematics, KNU-Center for Nonlinear Dynamics, Kyungpook National University, Daegu, Korea.
3. Department of Preventive Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
4. Department of Pharmacology, School of Medicine, Kyungpook National University, Daegu, Korea.