1. Conway Institute, Diabetes Complications Research Centre, School of Medicine and Medical Sciences, University College Dublin, Dublin, Ireland.
2. Plastic Surgery Department, Assiut University Hospital, Assiut, Egypt.
3. Department of Gastrosurgical Research and Education, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
4. Department of Medicine, Investigative Science, Imperial College London, London, United Kingdom.