1. Department of Chemistry, National Taiwan Normal University, Taipei 116, Taiwan, Department of Physics, National Taiwan University, Taipei 106, Taiwan, Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan, Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei 106, Taiwan, and Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei 106, Taiwan