1. Graduate School of Pharmaceutical Sciences, Tohoku University; 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan
2. School of Pharmaceutical Sciences, Ohu University, 31-1 Misumido, Tomita-machi, Koriyama, Fukushima 963-8611; Japan
3. Faculty of Pharmaceutical Science, Tohoku Medical and Pharmaceutical University; 4-4-1 Komatsushima, Aoba, Sendai 981-8558, Japan