Data extraction
Two authors (LLS and IS) independently extracted data from the included
studies using a predefined and structured data extraction form created
for this systematic review. In addition to the outcomes of interest, we
extracted the study characteristics (authors, year and journal of
publication), study design, inclusion and exclusion criteria, number of
patients and number of pregnancies with cirrhosis and if appropriate
number of controls of all included studies. In case of studies missing
data, we contacted first authors, at least two times, in attempt to
request these data.