Gathers all possible IDs from different input sources to provide a vector of all possible MGH or BWH IDs to be used as a data request for mi2b2 workbench.
mi2b2 workbench only works with MGH or BWH IDs, therefore curated IDs, such as PMRN cannot be used. However, as MGH and BWH IDs may change over time,
to access all possible images for given patients, a full list of all IDs over time for each patient is needed. For this all possible IDs need to gathered and returned.