Impact of chronic disease on quality of life among the elderly in the state of São Paulo, Brazil: a population-based study - Lima, Margareth Guimarães; Barros, Marilisa Berti de Azevedo; Cesar, Chester Luiz Galvão; Goldbaum, Moisés; Carandina, Luana; Ciconelli, Rozana Mesquita (Revista Panamericana de Salud Pública, 2009)