In Western culture, alternative medicine is any healing practice "that does not fall within the realm of conventional medicine", or "that which has not been shown consistently to be effective." It is often opposed to evidence based medicine and encompasses therapies with a historical or cultural, rather than a scientific, basis. Commonly cited examples include naturopathy, chiropractic, herbalism, traditional Chinese medicine, Unani, Ayurveda, meditation, yoga, biofeedback, hypnosis, homeopathy, acupuncture, and nutritional-based therapies, in addition to a range of other practices. It is frequently grouped with complementary medicine, which generally refers to the same interventions when used in conjunction with mainstream techniques, under the umbrella term complementary and alternative medicine, or CAM. Some researchers in alternative medicine oppose this grouping, preferring to emphasize differences of approach, but nevertheless use the term CAM, which has become standard.