hello I am trying to understand few basics things here if someone can help pls: - If Medplum is built over FHIR data, then can someone directly use FHIR API to get access to all data and don't need Medplum APIs? What's the benefit of Medplum that I am sure I am missing in understanding the nuance. - Does these APIs give access to one's (patient's) data across multiple hospital system? Can that be pulled directly or would need some sort of approval from hospital system? For example can I search my records (using my name, SSN etc) via these APIs for last 4-7 years or so across hospital systems I have been part of? If yes, is there a guide to point to that to see what is covered?