1 Research and Development, South Devon Healthcare National Health Service (NHS) Foundation Trust, Torquay, United Kingdom.
2 University Clinic of Podiatry, Complutense University of Madrid, Madrid, Madrid, Spain.
3 Department of Diabetes University Hospitals of Derby and Burton National Health Service (NHS) Foundation Trust, University Hospitals of Derby, Derby, United Kingdom.
4 Department of Medicine, Buddhist Tzu Chi General Hospital, Hualien City, Taiwan.
5 Faculty of Health, University of Plymouth, Plymouth, United Kingdom.