Selecting the optimal position of CDK4/6 inhibitors in hormone receptor-positive advanced breast cancer – the SONIA study: study protocol for a randomized controlled trial by A. van Ommen-Nijhof, I. R. Konings, C. J. J. van Zeijl, C. A. Uyl-de Groot, V. van der Noort, A. Jager, G. S. Sonke, On behalf of the SONIA study steering committee

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