Contribution to authorship
MW, HC and GQX conceived the study. WM drafted the manuscript and
contributed to data acquisition, analysis, and interpretation. HC and
GQX obtaining written consent from patients, obtaining ethical approval,
and participated in revising the final manuscript. XZZ, JWZ and LC were
the obstetricians of the pregnant women, and took responsibility for
collecting samples, and confirming data accuracy. LX, DJY,QMZ and QQT
were in charge of following up the mothers and the babies and collecting
the followed-up materials. QQL and HAK were in charge of the laboratory
tasks, including sample processing and detection.