confIntArea             Adds a confident interval area of a survival
                        model to a plot.
extractOneGroupOneEvent
                        Extracts one group and one event of a survfit
                        model as a data frame.
nrAtRisk                Adds number at risk of a survival model to a
                        plot.
survCurve               Draws a survival curve for one group and one
                        event.
survLable               Adds number at risk of a survival model to a
                        plot. Adds label to plot.
survPlot                Setup for a plot for survival data without the
                        curves.
