The doctor is in (literature): writing and medicine complement each other. 

I firmly believe that my medical studies had a vital influence on my literary activity; they significantly widened the sphere of my observation, enriched me with knowledge whose true value to me as a writer can only be appreciated by someone who himself is a doctor. They also had a guiding role and I was probably able to avoid many mistakes through my concern with medicine. Acquaintance with the natural sciences  and with the scientific method always kept me on my guard, and I tried where possible to keep scientific facts in mind, and where it was impossible I preferred not to write at all. I will note in passing that the conditions of artistic creativity do not always allow total agreement with scientific facts: one cannot depict death by poisoning on the stage the way it occurs in real life. But agreement with scientific facts must be felt even in these circumstances, that is, the reader and the viewer must clearly see that these are only conventions and that he is dealing with a writer who knows what is going on. I am not one of those writers who look askance at science, and I would not wish to be one of those who figure out everything with their own minds.

Anton Chekhov, letter to G.I. Rossolimo, October 11, 1899

For another excerpt from Chekhov, see here