Call for Papers Invitation for presentations. The congress organizers welcome the submission of program proposals. Individuals or groups of presenters are encouraged to submit proposals for posters, papers and symposia, in particular proposals relating to the two principle topics of the congress (validity and treatment outcome) are appreciated. Proposals should be submitted via the website. Program submission deadlines. Proposals for congress presentations (symposia, papers and posters) must be received by MARCH 1, 2008. Notifications of acceptance will be sent by the congress organizers before APRIL 15, 2008.