1. Diabetes Centre-Diabetic Foot Clinic, Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
2. ADOI National study group Vulnology and vascular dermatology, National Institute for health, migration and poverty (NIHMP), Rome, Italy
3. Environmental-Occupational Health Sciences and Non Communicable Diseases 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