Acknowledgements
This study was supported in part by a grant from Thailand Science Research and Innovation (TSRI), Chulabhorn Research Institute (grant number: 36822/4274380) and a grant from Thai Traditional Medicinal Knowledge Fund, the Department of Thai Traditional and Alternative Medicine, Ministry of Public Health, Thailand. The authors would like to thank all subjects who kindly participated in this study. Lastly, we are grateful to Dr. James M. Dubbs for proofreading.