Note on identifying visit types [todo]

[Miking98]

For determining which rows are ICU/ED/etc., the best way is to do the following:

1. Load the FEMR database of patients via: femr_db = femr.datasets.PatientDatabase("../EHRSHOT_ASSETS/femr/extract")
2. Retrieve a specific patient via: patient = femr_db[patient_id]
3. Retrieve all the ICU events for this patient via: femr.get_icu_events(patient, ontology) to get the list of ICU events for a specific patient
4. Loop through every event for this patient (i.e. for event in femr_db[patient_id].events). Every event that falls within the (start, end) of an ICU event can be considered to have occurred within an ICU event.

TODO -- confirm this works