Body Science Books

I am looking for two authors to each write two books from these subjects: The Heart and Muscles; Bones and Blood; Food, Digestion and Nutrition; The Immune System. Each is a book in an 8-part Body Science Series. Each book is 192 pages and will contain around 35,000 words. The books are aimed at a lay audience, 16 yrs +.
Initial work requires full table of contents and the first two chapters. The rest of the book will be commissioned when the series has been sold. Price is £100 for table of contents and £100 per 1000 words per book. Will need to see a list of your published works or evidence of your medical and writing background.