1. Faculty of Pharmaceutical Sciences, Khon Kaen University, Khon Kaen, Thailand
2. School of Pharmacy, Walailak University, Nakhon Si Thammarat, Thailand
3. Department of Pharmacognosy, Faculty of Pharmacy, Mahidol University, Bangkok, Thailand
4. Department of Pharmacognosy, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan