Advanced Drug Delivery Reviews, 171, 289-331 Advanced Drug Delivery Reviews Advanced Drug Delivery Reviews, Elsevier, 2021, 171, pp.289-331. ⟨10.1016/j.addr.2021.02.001⟩ Vinarov, Z, Abrahamsson, B, Artursson, P, Batchelor, H, Berben, P, Bernkop-Schnurch, A, Butler, J, Ceulemans, J, Davies, N, Dupont, D, Flaten, G E, Fotaki, N, Griffin, B T, Jannin, V, Keemink, J, Kesisoglou, F, Koziolek, M, Kuentz, M, Mackie, A, Melendez-Martinez, A J, McAllister, M, Mullertz, A, O'Driscoll, C M, Parrott, N, Paszkowska, J, Pavek, P, Porter, C J H, Reppas, C, Stillhart, C, Sugano, K, Toader, E, Valentova, K, Vertzoni, M, De Wildt, S N, Wilson, C G & Augustijns, P 2021, ' Current challenges and future perspectives in oral absorption research : An opinion of the UNGAP network ', Advanced Drug Delivery Reviews, vol. 171, pp. 289-331 . https://doi.org/10.1016/j.addr.2021.02.001 Advanced Drug Delivery Reviews, 171, pp. 289-331