1. Division of Biometry and Risk Assessment, National Center for Toxicological Research, Food and Drug Administration, Jefferson, Arkansas.
2. Institute of Statistical Science, Academia Sinica, Taipei, 115, Taiwan.
3. Institute of Biopharmaceutical Sciences, National Yang-Ming University, Taipei, 112, Taiwan.
4. Institute of Biomedical Sciences, Academia Sinica, Taipei, 115, Taiwan.
5. Institute of Biochemistry, National Yang-Ming University, Taipei, 112, Taiwan.