Study design and setting
This study was a retrospective study based on a prospectively collected
database including WWE with pregnancy (age: 18–45 years) in the
department of neurology in Xijing Hospital, Shaanxi Province, China, a
tertiary academic hospital.
This
study was approved by the Ethics Committee of Xijing Hospital
(KY20163380 - 1) and was in compliance with the Helsinki Declaration.