1. Xi'an Center for Disease Control and Prevention; 599 Xi Ying Road; Xi'an; Shaanxi; 710054
2. Department of Microbiology; University of Veterinary and Animal Sciences; Syed Abdul Qadir Jillani (Out Fall) Road; Lahore; 54600; Pakistan
3. Department of Immunology and Pathogenic Biology, Key Laboratory of Environment and Genes Related to Diseases; Chinese Ministry of Education, School of Medicine, Xi'an Jiaotong University; 76 West Yanta Road; Xi'an; Shaanxi; 710061
4. Obstetrics and Gynecology Department, Xijing Hospital; University of Fourth Military Medicine; 15 West Chang Le Road; Xi'an; Shaanxi; 710032
5. Hospital 518; 11 South Gong Yuan Road; Xi'an; Shaanxi; 710005
6. Shaanxi Center for Disease Control and Prevention; 3 Jian Dong Street; Xi'an; Shaanxi; 710054