Authors: Arjan W Braam; Philippe Delespaul; Aartjan T F Beekman; Dorly J H Deeg; Karine Pérès; Michael Dewey; Sirkka-Liisa Kivelä; Brian A Lawlor; Hallgrímur Magnússon; Ingeborg Meller; Martin J Prince; Friedel M Reischies; Marc Roelands; Pedro Saz; Robert A Schoevers; Ingmar Skoog; Cesare Turrina; Ann Versporten; John R M Copeland Journal: Eur J Ageing Date: 2004-11-11