1 Department of Radiation Oncology, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China.
2 State Key Laboratory of Respiratory Diseases, Guangzhou Institute of Respiratory Disease, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, China.
3 Department of General Disease, Health Center of Shuichun Town, Shanwei, China.
4 Department of Cardiovascularology, Tungwah Hospital of Sun Yat-sen University, Dongguan, China.
5 Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China.