It should be used in addition to regular stretching exercises and ultrasound diathermy. Additional interventions include modalities such as ultrasound, shortwave diathermy, laser therapy and electrical stimulation. Initially, modified medical diathermy sets transmitted interference. Induction welding of plastics, and some types of diathermy machines commonly operate in this range. Diathermy used in surgery is of typically two types. Shortwave diathermy can be applied in either continuous or pulsed mode. He wrote the first textbook on diathermy in 1913, which revolutionized the field. KALW's original transmitter was a modified GE medical diathermy machine. The three forms of diathermy employed by physical therapists are ultrasound, short wave and microwave. "Surgical diathermy" is usually better known as "electrosurgery". Another method is known as thermolysis, also called radio frequency (RF), shortwave or diathermy. Microwave diathermy is used in the management of superficial tumours with conventional radiotherapy and chemotherapy. Short wave diathermy operations use the ISM band frequencies of 13.56, 27.12, and 40.68 megahertz. In surgery diathermy is used to cauterize blood vessels to prevent excessive bleeding.