Ethics note

The study was carried out in accordance with all relevant applicable national guidelines for the care and use of animals. The study was granted ethical approval (approval Dnr ID 83, 39-10, and 33-15), by the Ethical Committee on Animal Experiments in Linköping, Swedish Board of Agriculture, Sweden. For Danish samples, collections were carried out in accordance with ethical guidelines and animal welfare legislation described in permission (2005/561-987) from the Danish Ministry of Justice.