I remember getting educated about MUMPS when we were researching about health informatics and interoperability in my PhD programme. My superviser said it was the earliest record system and also most reliable one. I was then opened to a rabbit hole of sophisticated electronic standards for health information exchange and standardisation for multi-domain medical knowledge/terminologies in hospitals. To this date I think it's still pretty much the same status quo if someone is to do research in this area and go for an introduction.