“…The remaining studies contacted previous donors' months to years after nephrectomy, with 20 studies not reporting the average time since donation (29)(30)(31)(32)(33)36,39,41,47,49,55,59,66,(68)(69)(70)(73)(74)(75)(76). The number of donors considered for follow-up was often unreported and thus for some studies, the response rate could not be calculated (37,39,41,52,56,59,64,68,72 (40,44,46,48,50,60,62,63,65,73,78) and five compared their characteristics to responders (40,44,46,50,65).…”