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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Ann Epidemiol. 2015 May 7;25(12):959–963. doi: 10.1016/j.annepidem.2015.04.005

Figure 1.

Figure 1

Difference in TTP between first prospectively observed attempt and mean of all retrospectively reported attempts with positive integers indicating a longer and negative integers a shorter prospectively observed TTP.