Assessing the scientific research productivity of a brazilian healthcare institution: a case study at the heart institute of São Paulo, Brazil - Tess, Beatriz Helena Carvalho; Furuie, Sérgio Shiguemi; Castro, Regina Célia Figueiredo; Barreto, Maria do Carmo Cavarette; Nobre, Moacyr Roberto Cuce (Clinics, 2009)