1. Department of Veterinary Medicine, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan 402, R.O.C.
2. Division of Zoology, Endemic Species Research Institute, Council of Agriculture, Executive Yuan, 1 Ming-Sheng E. Road, Chichi, Nantou, Taiwan 552, R.O.C.
3. Division of Residual Control, Agricultural Chemicals and Toxic Substance Research Institute, Council of Agriculture, Executive Yuan, 11 Guangming Road, Wufeng, Taichung, Taiwan 413, R.O.C.