Medical ghostwriter wanted

I am looking for someone with medical experience to do some ghostwriing chapters for a medical student textbook. There is also a lot of future work involved and could result in some permanent part time work if interested. Would also be useful if you had some proofreading and editing experience. This work is for a newly set up publishing group based on the web, in print and as apps. We are looking for someone to do work very affordably something like 50 pages for 50 pounds but negotiable. We need a writer as soon as possible. A lot of the work can be done over the net and the phone