1. Department of Surgery, Faculty of Medicine, Thammasat University, Pathum Thani, Thailand
2. Research Institute for Health Sciences, Chiang Mai University, Chiang Mai, Thailand
3. Department of Surgery, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
4. Shanghai Jiao Tong University School of Medicine, Shanghai, China
5. Diabetes Centre-Diabetic Foot Clinic, Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece