2.1. Study Population. A prospective longitudinal study was
performed at the Department of Obstetrics, University
Hospital of Zurich, to determine the relationship between
hemoglobin concentration and serum ferritin and adverse
outcome. The study was approved by the Human Research
Ethics Committee at the Women’s Hospital in Zurich.
The women were asked for their consent to participate in our
study and the informed consent was obtained before study
enrolment.