Content Editing

Looking for someone to rewrite content for our healthcare business website. We have a list of medicines and health conditions which we need to have content rewritten about. I am looking to establish a long-term relationship with someone who can write on blogs, squidoo lenses, etc., based on this task. Looking for someone who is independent and can research on different medical topics. Also, must be efficient and write good quality articles. Good English grammar is a must. I want to do a "test run" with a few articles to see if we are a good fit: I am looking for someone who can ultimately write 2-3 good quality articles per week, on an ongoing basis. However, I want to see how the first few articles are written before we continue the relationship. I would like to see examples of articles or blogs you have written. Content should not be copied from other sources. We need to optimize the site in future, hence candidates with a combined experience shall be given a priority.