[Tagging] meaning of office=physician

[Mateusz Konieczny]

What office=physician means? How it differs from amenity=doctors?

https://taginfo.openstreetmap.org/tags/office=physician#overview

I see it at 
https://wiki.openstreetmap.org/wiki/Proposed_features/Healthcare_2.0#Physician.27s_office 
but I am still confused

Is it simply duplicate of amenity=doctors or something else?
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