From memory the hope was to utilized a snowball survey (once you finish you forward onto other people in the population), which is generally what you use when you have a hard to define population.
One of the stats grads here, Jonathan Auerbach and I talked about starting multiple snowballs (Andrew’s blog, Discourse, Twitter, StanCon mailing lists, etc.) and then tracking what snowball people were recruited by (and if multiples) as a way of measuring coverage.
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