[1] Futian Dist Ctr Dis Control & Prevent, Emergency Off, Shenzhen 518040, Peoples R China
[2] Southern Med Univ, Affiliated Shenzhen Matern & Child Healthcare Hos, Dept Healthcare, Shenzhen 518048, Peoples R China
[3] Southern Med Univ, Affiliated Shenzhen Matern & Child Healthcare Hos, Dept Prevent Healthcare, Shenzhen 518028, Peoples R China
[4] Futian Dist Ctr Dis Control & Prevent, Dept Programme Immunizat, Shenzhen 518040, Peoples R China
[5] Southern Med Univ, Affiliated Shenzhen Matern & Child Healthcare Hos, Dept Obstet, Shenzhen 518028, Peoples R China
[6] Baoan Cent Hosp Shenzhen, Gushu Community Hlth Serv Ctr, Shenzhen 518102, Peoples R China