Figure 1.

Study cohort selection. USRDS = United States Renal Data System; ESRD = end-stage renal disease; DC = the District of Columbia; FSD = USRDS first service date; RUCA codes = rural urban commuting area codes.

Gessert et al. BMC Geriatrics 2013 13:39   doi:10.1186/1471-2318-13-39
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