Authors: Lennart Balk; Per-Ake Hägerroth; Gun Akerman; Marsha Hanson; Ulla Tjärnlund; Tomas Hansson; Gunnar Thor Hallgrimsson; Yngve Zebühr; Dag Broman; Torsten Mörner; Henrik Sundberg Journal: Proc Natl Acad Sci U S A Date: 2009-07-13 Impact factor: 11.205