1. Department of Pharmaceutical Botany, Faculty of Pharmacy, Mahidol University, 447 Sri-Ayuthaya Road, 10400 Bangkok, Thailand
2. Office for Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkoknoi, 10700 Bangkok, Thailand
3. Department of Pharmacognosy, Faculty of Pharmacy, Mahidol University, 447 Sri-Ayuthaya Road, 10400 Bangkok, Thailand
4. Laboratory of Biological Functions, Kitasato Institute for Life Sciences, Kitasato University 5 – 9-1, Shirokane, Minato-ku, 108 – 8641 Tokyo, Japan