The ECTS Working Group meetings began at ECTS Annual Congress several years ago, to provide a forum for focused discussion of specific issues in bone and mineral metabolism. This year, a total of 10 Working Groups will meet at ECTS Annual Congress in Valencia. The session will engage both basic scientists and clinical researchers from Europe, US and Asia. Working Group attendance is open to everyone, but a pre-registration is required. We anticipate around 50 participants and the small size and format of the meeting will enable lively discussions.