I. H. Zaini, W. Soewoto, and I. B. Budhi, “The Effect of Chemotherapy on Estradiol Levels in Patients with HER 2-Overexpression Breast Cancer in Dr Moewardi General Hospital, Surakarta, Indonesia”, Open Access Maced J Med Sci, vol. 9, no. B, pp. 1570–1574, Nov. 2021.