1. Maternal pre-pregnancy infection with hepatitis B virus and the risk of preterm birth: a population-based cohort study 
Jue Liu, PhD, Shikun Zhang, MD, Prof Min Liu, PhD, Qiaomei Wang, MD, Haiping Shen, MD, Yiping Zhang, MD 
The Lancet Global Health 
Volume 5, Issue 6, Pages e624-e632 (June 2017)
DOI: /S X(17)
Copyright © 2017 Elsevier Ltd Terms and Conditions

2. Figure 1
Study profile
The Lancet Global Health 2017 5, e624-e632DOI: ( /S X(17) )
Copyright © 2017 Elsevier Ltd Terms and Conditions

3. Figure 2
Subgroup analyses of associations between maternal pre-pregnancy HBsAG positivity (regardless of HBeAg) and risk of preterm birth
The Lancet Global Health 2017 5, e624-e632DOI: ( /S X(17) )
Copyright © 2017 Elsevier Ltd Terms and Conditions