Exhibit 8.1

• Ascendium Group Limited (incorporated in the British Virgin Islands)

• Our Medical Services, Ltd. (incorporated in the British Virgin Islands)

• US Proton Therapy Holdings Limited (incorporated in the British Virgin Islands)

• China Medical Services Holdings Limited (incorporated in Hong Kong)

• Cyber Medical Network Limited (incorporated in Hong Kong)

• King Cheers Holding Limited (incorporated in Hong Kong)

• China Medstar Pte. Ltd. (incorporated in Singapore)

• CMS Hospital Management Co., Ltd. (incorporated in the PRC)

• Beijing Xing Heng Feng Medical Technology Co., Ltd. (incorporated in the PRC)

• Shenzhen Aohua Medical Services Co., Ltd. (incorporated in the PRC)

• Shenzhen Aohua Medical Leasing and Services Co., Ltd. (incorporated in the PRC)

• Shenzhen Lingdun Medical Investment & Management Co., Ltd. (incorporated in the PRC)

• Tianjin Kangmeng Radiology Equipment Management Co., Ltd. (incorporated in the PRC)

• Chang’an CMS International Cancer Center (incorporated in the PRC)

• Medstar (Shanghai) Leasing Co., Ltd. (incorporated in the PRC)