Affiliation: | aAnalytical Research Laboratories, Eisai Co. Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 300-2635, Japan bAnalytical Research Laboratories, Eisai Co. Ltd., 22 Sunayama, Kamisu, Ibaraki 314-0255, Japan cDrug Development Technology, Eisai Co. Ltd., 5-1-3 Tokodai, Tsukuba, Ibaraki 300-2635, Japan |