| http://www.w3.org/ns/prov#value | - These other forces, or contributors, include, but are not limited to, a magnetic field including electromagnetic forces, an electrical current or iontophoresis, mechanical skin manipulation, chemical enhancement, heat, and osmotic forces. [0197] Transducer 1614 administers ultrasound preferably at frequencies of less than or equal to about 2.5 MHz, preferably at a frequency that is less than 1 MHz
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