Akinori Iwakami1, Goro Takada2, Norio Fukuda1, Hirotaka Asato3. 1. Division of Plastic and Reconstructive Surgery, Yamagata University Hospital, Yamagata, Japan. 2. Department of Plastic Surgery, Ashikaga Red Cross Hospital, Tochigi, Japan. 3. Department of Plastic and Reconstructive Surgery, Dokkyo Medical University, Tochigi, Japan.