1. Department of Surgery and Biomedical Research Institute, Chonbuk National University Hospital, Jeonju, Korea.
2. Department of Anatomy, Chonbuk National University Medical School, Jeonju, Korea.
3. Division of Internal Medicine, Iwamizawa Asuka Hospital, Iwamizawa, Japan.
4. Institute of Embryology, Universidad Complutense, Madrid, Spain.