Sherif M Badawy1,2, Alexis A Thompson1, Michael Sand3,4. 1. Department of Pediatrics, Division of Hematology, Oncology and Stem Cell Transplantation, Ann & Robert H. Lurie Children's Hospital of Chicago, Feinberg School of Medicine at Northwestern University, Chicago, Illinois, United States. 2. Department of Pediatrics, Division of Hematology and Oncology, Faculty of Medicine at Zagazig University, Zagazig, Egypt. 3. Dermatologic Surgery Unit, Department of Dermatology, Venereology and Allergology, Ruhr-University Bochum, Bochum. 4. Department of Plastic Surgery, St. Josef Hospital, Catholic Clinics of the Ruhr Peninsula, Essen, Germany.