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Single-select items with dynamic response values
I'm trying to figure out the best way to collect a data item in a CRF (an anonymised doctor ID code), which is required for QC purposes. Ideally, this would be a pre-defined single-select item, but the response values obviously have the potential to change quite a lot at each site over the course of a 10 year study, and with 15 sites this could run into forever having to update the response options for this field, and migrating all subjects (thousand of them) to the new CRF version each time.
Other than using a text field and accepting free text for this item (which is not ideal), we are not sure what other options we have. Does anyone have any ideas of any alternatives for collecting this item?