Evaluation of the bioavailability of major withanolides of Withania somnifera using an in vitro absorption model system - Devkar, S T; Kandhare, A D; Sloley, B D; Jagtap, S D; Lin, J; Tam, Y K; Katyare, S S; Bodhankar, S L; Hegde, M V (J Adv Pharm Technol Res, 2015)