1. Division of Pharmacopoeia and Standards for Drugs, Pharmaceuticals and Medical Devices Agency, Shin-Kasumigaseki Building, Kasumigaseki, Chiyoda-ku, Tokyo, Japan
2. Division of Genetics and Mutagenesis, National Institute of Health Sciences, Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa, Japan
3. Office of New Drug I, Pharmaceuticals and Medical Devices Agency, Shin-Kasumigaseki Building, Kasumigaseki, Chiyoda-ku, Tokyo, Japan