So a physician I shadowed wrote me a LOR. Interfolio shows that the letter totally checks out except it has a "non-official" letterhead.
So I contacted his office to see what this meant and they said he only uses a letterhead with his name/address/contact eg. there is no "official" letterhead for the office.
It is his own private practice, not a large hospital/ medical center/ university.
Is this likely to cause trouble? And if so what steps can I take to help ensure my app won't be held back due to this issue?