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