1. Department of Plastic and Reconstructive, Helios Clinic Emil von Behring, Berlin, Germany
2. Department of Plastic and Reconstructive Surgery, Linkou Medical Center, Chang Gung Medical College, Chang Gung University, Chang Gung Memorial Hospital, Taoyuan, Taiwan
3. Department of Surgery, Faculty of Medicine, University of Khartoum, Khartoum, Sudan
4. Department of Plastic and Reconstructive Surgery, James Cook University Hospitals NHS Trust, Middlesbrough, United Kingdom
5. Department of Surgery, Yale-New Haven Hospital, New Haven, CT, USA