Evaluation and testing of the proportional hazards assumption in analysis of time-to-event data in subgroup analysis of randomised controlled trials: a meta-epidemiological study by Dominique Lisa Birrer, Lukas Werner Widmer, Lulu Tanno, Romano Schneider, Amanda Dirnberger, Alexander Wilhelm, Urs Zingg, Beat Müller, Lorenz Meuli, Christoph Kuemmerli

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