Talk:Open Heart/@comment-38031979-20190312025305/@comment-37484301-20190312030222

You're not wrong. Usually, they would call each other Dr. unless they are in equal standing such as all the first year interns. Depending on the attending/mentor and the age difference too and as a sign of respect, the younger ones would call their mentors by "Doctor". I think you're right. It is a sign of them becoming close.