1. Melatonin Research Group; Faculty of Pharmaceutical Sciences; Khon Kaen University; Khon Kaen 40002 Thailand
2. Center for Research and Development of Herbal Health Product (CRD-HHP); Khon Kaen University; Khon Kaen 40002 Thailand
3. Synchrotron Light Research Institute (Public Organization); Nakhon Ratchasima 30000 Thailand
4. Centre for Research and Development of Medical Diagnostic Laboratories (CMDL); Faculty of Associated Medical Sciences; Khon Kaen University; Khon Kaen 40002 Thailand