Importance of extract standardization and in vitro/ex vivo assay selection for the evaluation of antioxidant activity of botanicals: a case study on three Rosmarinus officinalis L. extracts - Ibarra, A; Cases, J; Bily, A; He, K; Bai, N; Roller, M; Coussaert, A; Ripoll, C (J Med Food, 2010)