This book contains the contributions to the 34th Hemophilia Symposium, Hamburg 2003. The main topics are HIV infection and epidemiology, management of bleedings in hemophiliacs with inhibitors, orthopedic problems and therapy in hemophiliacs, therapy with protein C and pediatric hemostaseology. The volume is rounded off by numerous free papers and posters on hemophilia, hemophiliacs with inhibitors, thrombophilia and molecular diagnostics.