A total of 60 women will be sampled consecutively. Women eligible to participate will be those women who were registered at a maternal health care unit in the municipalities of Sundsvall and Timrå with subsequent childbirth registered at the Sundsvall-Härnösand County Hospital, Sweden. An invitation letter with a prepaid response envelope will be sent by postal mail to the eligible women by contact information retrieved from the labour ward. Women who respond will be enrolled and approve their participation by signed informed consent. The women will be included in the study according to inclusion and exclusion criteria following a baseline assessment that comprises a urinary test, questionnaires and clinical examination. After inclusion a blood sample, for serum and plasma, will be drawn at inclusion and directly after the treatment period.