The Board is the highest authority of the Working Group. It is composed of the coordinator and of the principal investigator of each participating site. All proposals of amendment of the Working Group contract have to be taken by the Board. The Board can also decide on any item proposed on its agenda by a Board member. The Board need not have a physical meeting to take decisions; all communication means can be used, provided all members receive the same information. Decisions are taken through a simple majority vote (with the coordinator vote taking precedence in case of a tie.)