Fourth EDEN-IDEA International Congress on Epidemiology Causes and Prevention of Skin Diseases "Dermato-epidemiology, Health Care Organization and the Reshaping of Clinical Dermatology," Venice, Italy, October, 10-12, 2004. Organizing Committee for the European Dermato-epidemiology Network and the International Dermato-epidemiology Association: Dr Luigi Naldi, Dr Jan Nico Bouwes Bavinck, Dr Thomas Diepgen, Dr Robert Stern, Dr Patrizio Sedona, Dr M. Dennis Linder, Dr Martin Weinstock, Dr Hywel Williams, and Dr Berthold Rzany. For information, contact Dr Luigi Naldi, U. O. Dermatologia, Ospedali Riuniti, L. go Barozzi 1, IT-24128 Bergamo; phone: +39-035-400625; fax: +39-035-253070; e-mail: luigi.naldi@gised.it.