[Wan, Qing-Song] Univ South China, Affiliated Hosp 1, Dept Nephrol, Hengyang 421001, Hunan, Peoples R China.
[Li, Li] Hunan Environm Biol Polytech, Dept Med, Hengyang, Peoples R China.
[Song, Na; Yang, Shi-Kun] Cent South Univ, Xiangya Hosp 3, Dept Nephrol, Changsha, Hunan, Peoples R China.
[Liu, Zi-Long] Univ South China, Affiliated Hosp 1, Dept Stomatol, Hengyang, Peoples R China.