Figure 1From: Challenges to be overcome using population-based sampling methods to recruit veterans for a study of post-traumatic stress disorder and traumatic brain injury Flowchart of each stage of the screening process. *One participant withdrew consent. Final enrollment n = 23. Note: the 11,337 total deployed “New Generation” sample was derived from a larger sample of 13,162 respondents after removing individuals who did not meet the age criteria (18- 50 years).Back to article page