Aging, Health,Work: Overview and Methodology of the VISAT Prospective Study By Jean-Claude Marquié, P. Jansou, Bruno Baracat, Corinne Martinaud, O. Gonon, M. Niezborala, J.-B. Ruidavets, Hervé Fonds, Yolande EsquirolVol. 65, 2002/3, pages 243 to 260