consultation of DOs unethical from 1923 until 1962. MDs regarded that osteopathic treatments were rooted in "pseudoscientific dogma", and although physicians from both branches of medicine have been able to meet on common ground, tensions between the two continue. In 1988, Petr Skrabanek classified osteopathy as one of the "paranormal" forms of alternative medicine, commenting that it has a view of disease which had no meaning outside its own closed system. In a 1995 conference address, the president of the Association of American Medical Colleges, Jordan J. Cohen, pinpointed OMT as a defining difference between MDs and DOs; while he saw there was no quarrel in the appropriateness of manipulation for musculoskeletal treatment, the difficulty centered on "applying manipulative therapy to treat other systemic diseases"—at that point, Cohen maintained, "we enter the realm of skepticism on the part of the allopathic world." In 1998, Stephen Barrett of Quackwatch said that the worth of manipulative therapy had been exaggerated and that the American Osteopathic Association (AOA) was acting unethically by failing to condemn craniosacral therapy. The article attracted a letter from the law firm representing the AOA accusing Barrett of libel and demanding an apology to avert legal action. In response, Barrett made some slight modifications to his text, while maintaining its overall stance; he queried the AOA's reference to "the body's natural tendency toward good health", and challenged them to "provide [him] with adequate scientific evidence showing how this belief has been tested and demonstrated to be true." Barrett has been quoted as saying, "the pseudoscience within osteopathy can't compete with the science". In 1999, Joel D. Howell noted that osteopathy and medicine as practiced by MDs were becoming increasingly convergent. He suggested that this raised a paradox: "if osteopathy has become the functional equivalent of allopathy, what is the justification for its continued existence? And if there is value in therapy that is uniquely osteopathic – that is, based on osteopathic manipulation or other techniques – why should its use be limited to osteopaths?" In 2004, the osteopathic physician Bryan E. Bledsoe, a professor of emergency medicine, wrote disparagingly of the "pseudoscience" at the foundation of OMT. In his view, "OMT will and should follow homeopathy, magnetic healing, chiropractic, and other outdated practices into the pages of medical history." In 2010, Steven Salzberg wrote that OMT was promoted as a special distinguishing element of DO training, but that it