Also, read journals that have high quality writing. Cell, Nature, ect are generally top notch in writing style (as well as the science impact of course). Clinically, New England Journal has great writing. I'm leaving out a ton, but that's a start.
Lastly, my PI at Memorial Sloan-Kettering gave me a copy of "How to Write and Publish a Scientific Paper" by Robert A. Day. Great book with funny anecdotes.