1. Research Laboratory, Dong-A Pharmaceutical Company, 47, Sangal-Ri, Kiheung-Up, Yongin, Kyungki-Do 449-900, Korea
2. College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, San 56-1, Shinlim-Dong, Kwanak-Gu, Seoul 151-742, Korea
3. Department of Diagnostic Pathology, College of Medicine, University of Ulsan, Asan Foundation, Asan Medical Center, 388-1, Pungnap-2-Dong, Songpa-Gu, Seoul 138-736, Korea