Using 4, 10, or 15 sites as case studies might be feasible, but we would still need to be concerned about the risks in generalizability.
There are concerns but we can still use the sites.
mnli hypothesis: There are concerns but we can still use the sites. premise: Using 4, 10, or 15 sites as case studies might be feasible, but we would still need to be concerned about the risks in generalizability.