Analysis of Yearly Variations in Drug Expenditure for One Patient Using Data Warehouse in a Hospital. - Yufeng Chen; Yasushi Matsumura; Katsuhiko Nakagawa; Shanmei Ji; Hirohiko Nakano; Tadamasa Teratani; Qiyan Zhang; Takahiro Mineno; Hiroshi Takeda (J. Medical Syst., 2007)