sentences:  It attracted more than 9,000 participants from around the world.The two-year cycle of the congress was continued until 1999, when it was decided that the rapid development of the medical specialty of radiology required an annual meeting of Europe's radiological community and all its partners.The ESR has continued to develop and refine its congress ever since, turning it into the largest radiological meeting in Europe with more than 28,000 participants from around 100 countries and 4,000 scientific papers and exhibits.