[Xing, Siyi] Hengyang Normal Univ, Coll Geog & Tourism, Hengyang 421010, Peoples R China.
[Zhu, Hong; Li, Jie; Chen, Xiaoliang] Guangzhou Univ, Sch Geog Sci & Remote Sensing, Guangzhou, Peoples R China.
[Li, Jie] Guangzhou Univ, Key Lab Philosophy & Social Sci, Guangdong Prov Maritime Silk Rd GD22TWCXGC15, Guangzhou, Peoples R China.
[Li, Jie] Guangzhou Univ, Guangdong Ctr Urban & Migrat Studies, Guangzhou, Peoples R China.
[Li, Xinmei] Univ Chinese Med, Guangdong Prov Hosp Chinese Med, Clin Coll Guangzhou 2, Dept Geriatr, Guangzhou 510120, Guangdong, Peoples R China.