1. Department of Nuclear Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, Republic of China.
2. School of Medicine, National Yang-Ming University, Taipei, Taiwan, Republic of China.
3. Section of Colorectal Surgery, Department of Surgery, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan, Republic of China.
4. Department of Nuclear Medicine, Taipei Veterans General Hospital, Taipei, Taiwan, Republic of China.