Influence of cultivation conditions, season of collection and extraction method on the content of antileishmanial flavonoids from Kalanchoe pinnata - Muzitano, M F; Bergonzi, M C; De Melo, G O; Lage, C LS; Bilia, A R; Vincieri, F F; Rossi-Bergmann, B; Costa, S S (J Ethnopharmacol, 2011)