The SHUR employed quota sampling, a non-probability sampling approach where we looked for specific characteristics of respondents and then obtained a tailored sample that is representative of the population of interest. The target was 4000 respondents living in urban areas in the contiguous USA. We assigned quotas for usual source of care and race/ethnicity. Black, Indigenous, and people color, as well as those who are poor, are more likely to receive care at specific sites rather than from a specific primary care physician with whom they have established a relationship [25]. Having a regular source of care, and the kind of place that people go to for usual care matters for relational aspects of care such as perceived respect and mistrust. Given this literature, we assigned a quota for usual source of care. At least half of the sample (n = 2000) must report a clinic or community health center, an emergency department or urgent care facility as their usual source of care, or report that they did not have a usual source of care.