<qa>  What is the benefit of withdrawing from the study?A written informed consent will be obtained from all the parents of the infants before the enrollment. The participation in the study does not cause any extra cost to the mother or the family. Participation is voluntary and withdrawing from the study is possible whenever desired during the pregnancy, the hospital stay or during the follow up period. Withdrawal does not affect the treatment or the follow up of the infant or the mother. If desired, approval from the ethical committees of each participating center will be obtained. 