1. Department of Pharmacology, Faculty of Pharmacy and Pharmaceutical SciencesFukuyama UniversityFukuyamaHiroshima729‐0292Japan
2. Institute for OTC ResearchWakunaga Pharmaceutical Co. LtdKohda‐choHiroshima739‐1195Japan
3. President of Hiroshima UniversityKagamiyamaHigashi‐hiroshima739‐8511Japan