Blog post articles

I need 30 high quality original articles written on the main subject: - back pain and treatment. (6 keyword phrases, each with 500+ words) I'll provide the complete keyword phrases list to the bid winner. The keyword phrases should be used in the following manner: -Keyword phrase as the title of article -Keyword phrase in the first sentence of the first paragraph -Keyword phrase in the first sentence of the last paragraph -Keyword phrase or variations of it 3-4 more times throughout the body - All articles must be written in American English, with perfect grammar and spelling. - Articles should be original, informative and interesting to read. - Any re-written or spun content will not be accepted. - Writing samples must be supplied with your bid. - Well researched with given keywords at right places. - Pass Copyscape (100% unique content)