Tjan-Heijnen, V C G, van Hellemond, I E G, Peer, P G M, Swinkels, A C P, Smorenburg, C H, van der Sangen, M J C, Kroep, J R, De Graaf, H, Honkoop, A H, Erdkamp, F L G, van den Berkmortel, F W P J, de Boer, M, de Roos, W K, Linn, S C, Imholz, A L T, Seynaeve, C M & Dutch Breast Cancer Research Group (BOOG) for the DATA Investigators 2017, ' Extended adjuvant aromatase inhibition after sequential endocrine therapy (DATA) : a randomised, phase 3 trial ', The Lancet Oncology, vol. 18, no. 11, pp. 1502-1511 . https://doi.org/10.1016/S1470-2045(17)30600-9 The Lancet Oncology, 18(11), 1502-1511 Lancet Oncology, 18, 11, pp. 1502-1511 LANCET ONCOLOGY, 18(11), 1502. Lancet Publishing Group The Lancet Oncology, 18(11), 1502-1511. Lancet Publishing Group Lancet oncology, 18(11), 1502-1511. Elsevier Science Lancet Oncology, 18(11), 1502-1511. Lancet Publishing Group Lancet Oncology, 18, 1502-1511