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Koenig, Jochem, van Ewijk, Reyn, Kuhr, Kathrin, Schmidberger, Heinz, Woeckel, Achim, Kreienberg, Rolf and Blettner, Maria (2016). Radiotherapy effects on early breast cancer survival in observational and randomized studies: a systematic analysis of advantages, disadvantages and differences between the two study types. Breast Cancer, 23 (3). S. 415 - 425. TOKYO: SPRINGER JAPAN KK. ISSN 1880-4233