Classon, Christer (21 April 2011). "Three slaps in the face". SOMA. No. 2. Karolinska University Hospital. Archived from the original on 27 July 2014. Retrieved 18 July 2014.
Classon, Christer (21 April 2011). "Three slaps in the face". SOMA. No. 2. Karolinska University Hospital. Archived from the original on 27 July 2014. Retrieved 18 July 2014.