1. Department of Presymptomatic Health Promotion, Institute of Natural Medicine, University of Toyama, Toyama City, Japan.
2. International Research Center for Traditional Medicine of Toyama Prefecture, Toyama City, Japan.
3. Division of Biostatistics and Clinical Epidemiology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama City, Japan.
4. Institute of Environmental Science for Human Life, Ochanomizu University, Tokyo, Japan.
5. Graduate School of Natural Science and Technology, Kanazawa University, Kanazawa City, Japan.