Figure 1From: Mortality ascertainment of participants in the National Wilms Tumor Study using the National Death Index: comparison of active and passive follow-up resultsBreakdown of NWTS* cohort by January 1, 2002 vital status and NDI* match status.* NWTS, National Wilms Tumor Study; NDI, National Death Index.† Record not sent to the NDI due to an error in date last seen which was later corrected.Back to article page