Kian-Yong Than1,2, Ting-Wei Chiang1,2, Tzong-Shiun Li3,4,5. 1. Department of Plastic Surgery, China Medical University Hospital, Taichung, Taiwan. 2. Department of Plastic Surgery, China Medical University Beigang Hospital, Beigang, Taiwan. 3. Department of Plastic Surgery, China Medical University Hospital, Taichung, Taiwan. li.tsa2@msa.hiet.net. 4. Department of Plastic Surgery, China Medical University Beigang Hospital, Beigang, Taiwan. li.tsa2@msa.hiet.net. 5. School of Medicine, China Medical University, Taichung, Taiwan. li.tsa2@msa.hiet.net.