- Correspondence to Dr Hege Grindem, NIMI/NAR, PB 3843 Ullevål Stadion, Oslo 0855, Norway;
- Accepted July 14, 2015
- First published August 3, 2015.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.