1. Department of Vascular Surgery, Saiseikai Kawaguchi General Hospital, Saitama, Japan
2. Department of Plastic and Reconstructive Surgery, University of Tokyo, Tokyo, Japan
3. Department of Plastic and Reconstructive Surgery, Oxford University Hospitals NHS Trust, Oxford, UK
4. Department of Clinical Trial Data Management, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
5. Department of Maxillofacial Surgery, University of Siena, Siena, Italy