Details of ethics approval The Akershus Birth Cohort Study was approved by the Regional Committees for Medical and Health Research Ethics in Norway (S-080113a, Feb 12, 2008). All participants signed an informed consent form.
Details of ethics approvalThe Akershus Birth Cohort Study was approved by theRegional Committees for Medical and Health Research Ethicsin Norway (S-080113a, Feb 12, 2008). All participantssigned an informed consent form.