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Repeated events survival models: the conditional frailty model.
Box-Steffensmeier JM, De Boef S. Box-Steffensmeier JM, et al. Among authors: de boef s. Stat Med. 2006 Oct 30;25(20):3518-33. doi: 10.1002/sim.2434. Stat Med. 2006. PMID: 16345026