“Scientists disagree vigorously with one another as they attempt to build the case for new advancements; this peer review is the heart of the scientific process, one of the tools and techniques scientists have developed to encourage the flow of good ideas and sift out bad one. Unfortunately, Dr. Chopra chooses to circumvent that path, publishing his claims as self-help books rather than subjecting them to the rigors of scientific review.”
And a second related article