1. National Institute of Health Sciences, Division of Pharmacognosy, Phytochemistry and Narcotics, Setagaya-ku, Kamiyoga, Tokyo, Japan
2. HerbResearch Germany, Tussenhausen-Mattsies, Germany
3. Institut für Pharmazeutische Biologie und Phytochemie, Westf. Wilhelms-Universität, Münster, Germany