Concord Medical Services Holdings Limited, through its subsidiaries, operates a network of radiotherapy and diagnostic imaging centers. Its services include linear accelerators external beam radiotherapy, gamma knife radiosurgery, head gamma knife systems, body gamma knife systems, CyberKnife robotic radiosurgery system, proton beam therapy systems, and diagnostic imaging services. The company also offers other treatments and diagnostic services through the use of medical equipment comprising electroencephalography for the diagnosis of epilepsy; thermotherapy for pain relief after radiotherapy and chemotherapy; ultrasound therapy for the treatment of cancer; stereotactic radiofrequency ablation for the treatment of Parkinson s disease; and refraction and tonometry for the diagnosis of ophthalmic conditions. In addition, it provides clinical support services, such as developing treatment protocols for doctors; and organizing joint diagnosis between doctors in its network and clinical research. Further, the company offers radiotherapy and diagnostic equipment leasing and management services to hospitals, as well as sells medical equipment. Additionally, it also engages in establishing the Beijing Proton Medical Center that would offer radiotherapy treatment options to cancer patients; and other specialty cancer hospitals that would offer radiotherapy services, diagnostic imaging services, chemotherapy, and surgery. As of December 31, 2015, the company operated a network of 127 centers based in 76 hospitals, spanning 53 cities across 25 provinces and administrative regions in China. Concord Medical Services Holdings Limited was incorporated in 2007 and is headquartered in Beijing, the People s Republic of China.