1. Institute of Environmental Health, College of Public Health; National Taiwan University; Taipei 10055 Taiwan Republic of China
2. Graduate Institute of Anatomy and Cell Biology, College of Medicine; National Taiwan University; Taipei 100 Taiwan Republic of China
3. Laboratory Animal Center, College of Medicine; National Taiwan University; Taipei 100 Taiwan Republic of China
4. Graduate Institute of Molecular and Comparative Pathobiology, School of Veterinary Medicine; National Taiwan University; Taipei 106 Taiwan Republic of China