V. Summary of Exchange Seminar : Results of Analysis of the Contents of Questions and Answers and Descriptions in the Response Papers(Exchange Seminar: Lesson from International Differences in the Decision Making Process for Percutaneous Endoscopic Gastrostomy or Tube Feeding in the Elderly and Approaches to Ethical Issues Starting with the Right of Choice,<Special Issue>The 16^th Annual Scientific Meeting of Japan Academy of Gerontological Nursing)