The Mongols made culture portable. It was not enough to merely exchange goods, because whole systems of knowledge had to also be transported in order to use many of the new products. Drugs, for example, were not profitable items of trade unless there was adequate knowledge of how to use them. Toward this objective, the Mongol court imported Persian and Arab doctors into China, and they exported Chinese doctors to the Middle East. Every form of knowledge carried new possibilities for merchandising. It became apparent that the Chinese operated with a superior knowledge of pharmacology and of unusual forms of treatment such as acupuncture, the insertion of needles at key points in the body, and moxibustion, the application of fire or heat to similar areas. Muslims doctors, however, possessed a much more sophisticated knowledge of surgery, but, based on their dissection of executed criminals, the Chinese had a detailed knowledge of internal organs and the circulatory system. To encourage a fuller exchange of medical knowledge, the Mongols created hospitals and training centers in China using doctors from India and the Middle East as well as Chinese healers.