1. Department of Internal Medicine University of Iowa Carver College of Medicine Iowa City Iowa USA
2. Department of Internal Medicine Chiang Mai University Faculty of Medicine Chiang Mai Thailand
3. Environmental ‐ Occupational Health Sciences and Non Communicable Diseases Center Research Group, Research Institute for Health Sciences, Chiang Mai University Chiang Mai Thailand
4. Department of Surgery, Faculty of Medicine Chiang Mai University Chiang Mai Thailand
5. Department of Neurology University of North Carolina at Chapel Hill Chapel Hill North Carolina USA
6. Department of PsychiatryGeisel School of Medicine at Dartmouth Hanover New Hampshire USA
7. Department of Ophthalmology Chiang Mai University Faculty of Medicine Chiang Mai Thailand
8. Department of Neurology Geisel School of Medicine at Dartmouth Hanover New Hampshire USA