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Illustration of time points in model used for generalized estimating equations. Note that for participants that were included twice (n = 297), baseline variables (T0) were used as risk factors for the T0-T1 interval, and T1 variables were used as risk factors for the T1-T2 interval. A total of 338 participants had no follow-up measurement at T2 and were thus not analyzed for the T1-T2 interval.
