Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Steven Barrett-anti-everything except swallowing pills!

All of Steven Barretts books are heavily biased, and extremely under researched. If Mr. Barrett could publish a manuscript in any of the leading peer-reviewed spinal journals, discussing spinal biomechanics, articular neurology, and/or bio-neuro-mechanical principles, I might listen to what he has to say.Mr. Barrett holds no authority to discuss contemporary Chiropractic and its fundamental principles. If his books were truly objective He would refer his readers to the scientific journals in which Chiropractic has published many papers. ie, SPINE--The #1 Journal in the world, as well as many others.