Decreased Inhibition of Proliferation and Induction of Apoptosis in Breast Cancer Cell Lines (T47D and MCF7) from Treatment with Conditioned Medium Derived from Hypoxia-Treated Wharton’s Jelly MSCs Compared with Normoxia-Treated MSCs - Widowati, Wahyu; Murti, Harry; Widyastuti, Halida; Laksmitawati, Dian; Rizal, Rizal; Kusuma, Hanna; Sumitro, Sutiman; Widodo, M; Bachtiar, Indra (International Journal of Hematology-Oncology and Stem Cell Research, 2021)