1. Graduate School of Horticulture; Chiba University; 648; Matsudo; 271-8510; Japan
2. The Mainichi Newspapers (Formerly Faculty of Horticulture, Chiba University); 1-1-1, Hitotsubashi; Chiyoda, Tokyo; 100-8051; Japan
3. Faculty of Education; Wakayama University; 930, Sakaedani; Wakayama; 640-8510; Japan