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The 11th International Symposium on Graph Drawing (GD 2003) was held on September 21–24, 2003, at the Universit` a degli Studi di Perugia, Perugia, Italy. GD 2003 attracted 93 participants from academic and industrial institutions in 17 countries. In response to the call for papers, the program committee received 88 re- larsubmissionsdescribingoriginalresearchand/orsystemdemonstrations.Each submission was reviewed by at least 4 program committee members and c- ments were returned to the authors. Following extensive e-mail discussions, the program committee accepted 34 long papers (12 pages each in the proceedings) and 11 short papers (6 pages each in the proceedings). Also, 6 posters (2 pages each in the proceedings) were displayed in the conference poster gallery. In addition to the 88 submissions, the program committee also received a submission of special type, one that was not competing with the others for a time slot in the conference program and that collects selected open problems in graph drawing. The aim of this paper, which was refereed with particular care andUNCHANGEDtworoundsofrevisions,istostimulatefutureresearchinthe graph drawing community. The paper presents 42 challenging open problems in di?erentareasofgraphdrawingandcontainsmorethan120references.Although the length of the paper makes it closer to a journal version than to a conference extended abstract, we decided to include it in the conference proceedings so that it could easily reach in a short time the vast majority of the graph drawing community.

Computer science. --- Computer software. --- Computational complexity. --- Computer graphics. --- Computer Science. --- Discrete Mathematics in Computer Science. --- Algorithm Analysis and Problem Complexity. --- Computer Graphics. --- Computer graphics --- Graph theory --- Engineering & Applied Sciences --- Technology - General --- Mathematics. --- Algorithms. --- Computer science --- Discrete mathematics. --- Discrete Mathematics. --- Software, Computer --- Computer systems --- Complexity, Computational --- Electronic data processing --- Machine theory --- Automatic drafting --- Graphic data processing --- Graphics, Computer --- Computer art --- Graphic arts --- Engineering graphics --- Image processing --- Digital techniques --- Computer science—Mathematics. --- Algorism --- Algebra --- Arithmetic --- Discrete mathematical structures --- Mathematical structures, Discrete --- Structures, Discrete mathematical --- Numerical analysis --- Foundations

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Population aging and the associated burden of chronic diseases are one of the main challenges in public health worldwide. This Research Topic on "Active Aging and Disease Management" provides a comprehensive overview of population aging through fourteen comprehensive papers. Chapter 1 discusses an overview of health systems in active and healthy aging, while Chapter 2 focuses on the role of lifestyles, exercise and new technologies. Chapter 3 debates psychological and cognitive issues in aging and finally in Chapter 4, an older people self assessment is proposed and the role of communities and supporters are highlighted. We think that real social and health care integration at community level could be the key point to deliver effective health promotion and preventive intervention. Enjoy the reading!

Geriatrics. --- Older people --- preventing disability --- dietary intake --- Active aging --- chronic diseases --- Life styles --- Mental Health --- Disease Management --- New technologies --- Elderly --- physical activity --- Health and hygiene. --- preventing disability --- dietary intake --- Active aging --- chronic diseases --- Life styles --- Mental Health --- Disease Management --- New technologies --- Elderly --- physical activity