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You have to study in university to be a doctor and graduate
So the Doctor and River can catch up to eachother on what they have done.
Doctors - A group of doctors. 'Where are all the doctors?'
Doctor's - A possession of the doctor's. 'I picked up the doctor's pen'.
Doctor's - Meaning, Doctor is. 'The Doctor's busy right now'.
It depends up on the clinic and experience of the doctor.
up to $306,964