Fig 1.
Sampling strategy for neighborhood identification.
Fig 2.
SPAFF study interview guide.
Table 1.
Integrated use of web-based tools for field management and data collection.
Fig 3.
Sample custom Google map for a specific recruitment site in Brooklyn, NY.
Fig 4.
Flow chart to guide interviewers with data collection and field management.
Table 2.
Sample description.
Table 3.
Key sampling variables by recruitment site compared to the NYC/NJ distribution.