Dr. Monden is a member of the International College of Surgeons, the International Surgical Society, the Transplantation Society, the International Gastro-Surgical Club, American Association for the Study of Liver Disease, American Association of Cancer Research, American Gastroenterological Association, American Society of Clinical Oncology, New York Academy of Sciences, the Japan Surgical Society, the Japanese Society of Gastroenterological Surgery, the Japanese Society for Clinical Surgery, the Japan Society for Transplantation, the Japanese Society for Vascular Surgery, the Japanese Cancer Association, the Japan Society of Clinical Oncology, the Japanese Society for Hepatology, and the Japanese Society of Gastroenterology