1. Diabetes Center, Institute for Clinical and Experimental Medicine, Vídeňská 1958, 140 21 Prague, Czech Republic
2. Department of Social Work, Faculty of Arts, Charles University, 116 42 Prague, Czech Republic
3. Diabetes Unit, Derby Hospitals NHS Foundation Trust, Derby DU22 3NE, UK
4. Center for Lower Extremity Ambulatory Research, Dr. William M. Scholl College of Podiatric Medicine, Rosalind Franklin University of Medicine and Science, Chicago, IL 60064, USA